Roni and Allie are mowing the grass at the soccer field. Roni has a riding lawn mower and can mow the field in 30 minutes. Allie is pushing a lawn mower and can mow the field in 75 minutes.
If Roni and Allie work together to mow the field, what part of the field would Roni mow?
A. about 0.52 of the field
B. about 0.64 of the field
C. about 0.71 of the field
D. about 0.87 of the field
Answers
Answer: C. about 0.71 of the field
Step-by-step explanation:
Since, Roni can mow the field in 30 minutes.
Thus, the work done by Roni in one day = 1/30
And, Allie can mow the field in 75 minutes.
Thus, the work done by Allie in one day = 1/75
⇒ The total work done by Roni and Allie in one day when they worked simultaneously,
= [tex]\frac{1}{30} + \frac{1}{75}[/tex]
= [tex]\frac{5}{150} + \frac{2}{150}[/tex]
= [tex]\frac{7}{150}[/tex]
[tex]\implies \text{The part of work done by Roni} = \frac{\text{the work done by her in one day}}{\text{Total work they done in one day}}[/tex]
[tex]= \frac{1/30}{7/150}[/tex]
[tex]= \frac{5}{7}=0.714285714\approx 0.71[/tex]
⇒ Option C is correct.
Related Questions
The mean lifespan of a sylvania light bulb is 1600 hours with a standard deviation of 300 hours, an iqr of 450 hours, and a range of 690 hours. the lifespan distribution is relatively symmetric. which measure of spread is the best measurement?
Answers
Since, the distribution is relatively symmetric, the measure of spread that is the best measurement is the standard deviation.
Eddie purchased 4 packages of light bulbs and received a 15% discount. He also paid $4.85 in taxes on his purchase. Write an algebraic expression to represent the total amount Eddie paid. Let x represent the cost of each package purchased.
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if 4x +5=9x-2,then x=
Answers
9x - 4x = 5 + 2
5x = 7
x = 7/5
x = 1.4
Let f(x) = x2 and g(x) = x − 3. Evaluate (g ∘ f)(0).
Answers
g(f(0)) = 0 - 3 = -3
answer
(g ∘ f)(0) = -3
The value of ( g o f ) (0) is -3.
Here,
The function is given as;
[tex]f (x) = x^{2}[/tex] and [tex]g (x) = x-3[/tex]
We have to find the value of ( g o f ) (0).
What is Composite function?
Composite function is an operation that takes two functions f and g and produces a function k such that k (x) = g(f(x)).
Now,
The function are;
[tex]f (x) = x^{2}[/tex] and [tex]g (x) = x-3[/tex]
Simplify ( g o f ) (0) as;
⇒ [tex]( g o f ) (0) = g ( f (0)) = g (0) = 0-3 = -3[/tex]
Hence, The value of ( g o f ) (0) is -3.
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Hellllp pleaseeeee !
Answers
Find the area of the trapezoid.
144 square units
72 square units
88 square units
44 square units
Answers
area = 13+9=22
22/2 = 11
11x 4 = 44 square units
Answer:
44 square units
Step-by-step explanation:
Area of the trapezoid formula is [tex]\frac{base1 + base2}{2} \cdot height[/tex]
To find the base and the height we count the number of units in the graph
Base 1= 13
Base 2= 9 and height = 4
Now plug in all the values in the formula and find the area of the trapezoid
Area of the trapezoid=[tex]\frac{base1 + base2}{2} \cdot height[/tex]
=[tex]\frac{13+9}{2} \cdot 4[/tex]
=[tex]\frac{22}{2} \cdot 4[/tex]
=44 square units
if a number is a natural number, then it is also a whole number? what is the Inverse, the Converse, the Contrapositive, and the Bi-Conditional? and what is the Truth value for each one?
Answers
The original statement, 'If a number is a natural number, then it is also a whole number' is true because every natural number falls into the set of whole numbers. However, its converse is not true, as whole numbers include 0, which is not a natural number, making the inverse and the bi-conditional false. The contrapositive of the statement is true, maintaining logical consistency.
Explanation:If a number is a natural number, then it is indeed also a whole number. The relationship between natural numbers and whole numbers is an inclusive one, where all natural numbers (1, 2, 3, ...) are also whole numbers (0, 1, 2, 3, ...). The original statement can be expressed in logical form as: If P, then Q, where P is 'a number is a natural number,' and Q is 'it is also a whole number.'
Here is how the other forms of the statement look:
The inverse negates both the hypothesis and the conclusion: If not P, then not Q. So, 'If a number is not a natural number, then it is not a whole number.'
The converse switches the hypothesis and the conclusion: If Q, then P. For our statement, 'If a number is a whole number, then it is also a natural number.'
The contrapositive negates and switches the hypothesis and conclusion: If not Q, then not P. Therefore, 'If a number is not a whole number, then it is not a natural number.'
The bi-conditional states that P if and only if Q: A number is a natural number if and only if it is a whole number.'
The truth value of the original statement is true since all natural numbers are whole numbers. However, the converse is not true because whole numbers also include 0, which is not a natural number. Consequently, the inverse and the bi-conditional are false. The contrapositive is true because if it is not a whole number, then it can't be a natural number (considering that whole numbers include all natural numbers).
The area of a sale is 40.5 ft.² the base and height of the sail equal what is the height of the cell
Answers
If the absolute value of a nonzero real number is equal to the opposite of the number, the number is __________.
positive
negative
zero
irrational
Answers
If the absolute value of a nonzero real number is equal to the opposite of the number then the number is negative.
What is Number system?A number system is defined as a system of writing to express numbers.
We have to find the number for the absolute value of a nonzero real number is equal to the opposite of the number
The absolute value of a number is its numerical value without regard to its sign.
So if the absolute value of a number is equal to the opposite of the number, it means that the sign of the number must be negative.
Hence, if the absolute value of a nonzero real number is equal to the opposite of the number then the number is negative.
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Find out the probability of rolling two dices being total of “7”.
What is all the combination of two dices making total of “7” ?
What is the probability of rolling two dices being total of “7”?
Answers
In how many ways we can get 7:
1) 1+6
2) 2+5
3) 3+4
4) 4+3
5) 5+2
6) 6+1
So there are 6 ways to get a 7,
Hence P(of getting a sum =7) = 6/36 = 1/6 = 0.1667
When two dice are rolled, there are 6 feasible outcomes out of 36 that will sum to '7', hence the probability is 1 out of 6, or approximately 0.167.
Explanation:In the field of probability, when you roll two dice, there are 6 possible outcomes for each die, hence giving us 36 possible outcomes altogether (6*6=36). Out of these 36 possible outcomes, there are 6 combinations that can total to '7'. These combinations are: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1). Therefore, the probability of rolling a '7' with two dice is 6 out of 36, which simplifies to 1 out of 6, or approximately 0.167, when rounded to three decimal places.
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What is the simplified form of cos C ?
A. √2/2
B. 1
C. √2
D. √5/2
Answers
cosC = 5/(5√2)
5/5 is equal to 1, so they cancel each other out to leave just √2.
The simplified form of cos C is sqrt(2)/2.
What is cos ?"Cos is the cosine function of a right triangle in trigonometry. Cos function is the ratio of adjacent side and hypotenuse. It helps us to find the length of the sides of the triangle, irrespective of given angle.
Suppose we have a right triangle and α is the angle between adjacent side and hypotenuse, then as per the cos function, we can write
Cos α = Adjacent Side/Hypotenuse"
Here, given the base of the triangle is = 5
and hypotenuse is = 5sqrt2
So, [tex]cos C = 5/5\sqrt2 = 1/\sqrt2[/tex]
Multiplying both numerator and denominator by sqrt2
We get [tex]\sqrt2/2[/tex].
Hence, the value of cos C is [tex]\sqrt2/2[/tex]
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The area of one face of a cube is 25 cm2 . what is the surface area of the cube
Answers
If the area of one side of a cube is 25 cm², then
surface area of the cube = 25 * 6 = 150 cm²
If the area of one face of a cube is 25 cm2 . what the surface area of the cube will be is: 150cm²
Let x represent the surface area of the cube
Hence:
Surface area of a cube of edge x =6x²
Surface area of the cube =6(25cm)²
Surface area of the cube=150cm²
Inconclusion if the area of one face of a cube is 25 cm2 . what the surface area of the cube will be is: 150cm²
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Identify a reflection about the x-axis or a reflection about the y-axis of ƒ(x) = 7x2 – x3 by observing the equation of the function g(x) = –7x2 + x3.
Answers
The function g(x) = –7x² + x³ is the reflection of the function f(x) = 7x² – x³ about the x-axis. This is observed by the change in signs of each term in the function's equation after performing the reflection.
Explanation:By observing the given equation, f(x) = 7x² – x³ and g(x) = –7x² + x³, it is clear that the function f(x) reflects about the x-axis to create function g(x). This is indicated by the change of signs of each term in the equation of the function.
To elaborate, a reflection about the x-axis sees a function's equation change y(x) to -y(x). In our example, f(x) becomes -f(x) or –(7x² – x³), which after simplifying gives us –7x² + x³ = g(x). Therefore, g(x) is the reflection of f(x) about the x-axis.
Furthermore, to identify a reflection about the y-axis, observe if the equation changes from f(x) to f(-x). An even function or a function symmetric about the y-axis would not change with this transformation. Conversely, an odd function would change signs, just like our function did when reflecting over the x-axis.
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To make a greeting card Bryce used 1/8 sheet of red paper,3/8 sheet of green paper and 7/8 sheet of white paper. How much paper did Bryce use
Answers
a food store makes a 11-pound mixture of peanuts, almonds, and raisians. The cost of peanuts is $1.50 per pounds, almonds cost $3.00 per pound, and raisins cost $1.50 per pound. The mixture calls for twice as many peanuts as almounds. The total cost of the mixture is $21.00. How much of each ingredient did the store use.
Answers
How do you find the coordinates of the midpoint of segment VW with the end points of V(-2,-6) and W(x+2, y+3)
Answers
The coordinates of the midpoint of segment VW are (x/2, (y-3)/2).
Explanation:To find the coordinates of the midpoint of segment VW, we can use the midpoint formula.
The midpoint formula states that the x-coordinate of the midpoint is the average of the x-coordinates of the endpoints, and the y-coordinate of the midpoint is the average of the y-coordinates of the endpoints.
Given the endpoints V(-2, -6) and W(x+2, y+3), we can find the x-coordinate of the midpoint by taking the average of the x-coordinates: (-2 + (x+2))/2.
Similarly, we can find the y-coordinate of the midpoint: (-6 + (y+3))/2.
So the coordinates of the midpoint are (x/2, (y-3)/2).
solve for z 15 points
Answers
[tex]Step^1:[/tex] we have to [tex]simplify[/tex] your factions
[tex]Like: [/tex] [tex]z - \frac{4}{9} - \frac{1}{3} = \frac{5}{9} [/tex]
[tex]Replace[/tex] the [tex]subtraction [/tex] symbol to the [tex]additional [/tex] symbol since [tex]adding[/tex] is the opposite of [tex]subtraction [/tex] (since we changed the symbols the first two fractions numerators becomes a negative)
Our problem becomes: [tex] z + \frac{-4}{9} + \frac{-1}{3} = \frac{5}{9} [/tex]
Let's gather all of our "[tex]like-terms[/tex]" (if we have any in this question/problem)
[tex]Like: [/tex] [tex]z + \frac{-4}{9} + \frac{-1}{3} \\ = \frac{5}{9} [/tex]
The step we just did when we [tex]solved [/tex] it gave us: [tex]z + \frac{-7}{9} = \frac{5}{9} [/tex]
For our last step: Let's [tex]Add [/tex] by the number/fraction [tex] \frac{7}{9} [/tex] on each of your sides that we're working with!
[tex]Like:[/tex] [tex]z + \frac{-7}{9} + \frac{7}{9} (Cancel) \\ = \frac{5}{9} + \frac{9}{9} (Keep) [/tex]
Therefore, we have came to our [tex]answer[/tex] , which is: [tex]z = \frac{4}{3} [/tex]
Good luck on your assignment and enjoy your day!
[tex]MeIsKaitlyn:)[/tex]
Sorry, I was late to answering your question :(
The number of miles driven varies directly with the number of hours in the car. Billy drives 171 miles in 3 hours, so he could drive _____ miles in 4.5 hours.
Answers
Billy drives 171 miles in 3 hours, so he could drive 256.5 miles in 4.5 hours.
What is speed?The distance covered by the particle or the body in an hour is called speed. It is a scalar quantity. It is the ratio of distance to time.
We know that the speed formula
Speed = Distance/Time
The number of miles driven varies directly with the number of hours in the car.
Billy drives 171 miles in 3 hours.
Then the number of miles he can drive in 4.5 hours will be
Let x be the number of miles covered in 4.5 hours.
The speed remains constant.
Then we have
x / 4.5 = 171 / 3
x = 256.5 miles
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Billy could drive 256.5 miles in 4.5 hours.
Explanation:To find the number of miles Billy could drive in 4.5 hours, we will use the concept of direct variation. Direct variation states that when two variables are directly proportional, their ratio is constant.
Given that Billy drives 171 miles in 3 hours, we can set up a proportion:
Miles driven / Hours in the car = Miles driven / Hours in the car
Using the given values, we have:
171 / 3 = x / 4.5
To solve for x, cross multiply:
3x = 171 * 4.5
Divide both sides by 3:
x = (171 * 4.5) / 3
Simplifying the right side of the equation gives us:
x = 256.5
Therefore, Billy could drive 256.5 miles in 4.5 hours.
Jonah is arranging books on a shelf. The order of the books matters to him. There are 336 ways he can arrange the books. Choose True or False for each statement.
Answers
The sum of the probabilities of any event and its complement is always 1.
The student's question involves probability and arrangement of objects, which falls under the subject of mathematics. More specifically, the problem relates to permutations and the fundamental counting principle, combined with basic probability concepts.
Statement 36: The sample space is the set of all possible outcomes that can occur. Since there are 12 different books, the sample space consists of these 12 unique titles, where 8 are fiction (F1 to F8) and 4 are nonfiction (N1 to N4). The sample space is therefore: {F1, F2, F3, F4, F5, F6, F7, F8, N1, N2, N3, N4}.
Statement 37: The sum of the probabilities of an event and its complement is always 1. This is because an event and its complement together cover all possible outcomes in the sample space.
What can child-care homes and facilities do to help families and reduce the risk of child abuse?
Answers
They can review staff behavior expectations, have special considerations for very young children and make sure child case spaces are designed well.
Hope This Helps You!
Good Luck :)
Answer:
If a staff member notices behavioral changes in the child it could improve the situation if a staff member subtly questioned the child not alarming anything and if the child is aware of abuse the staff member could quickly respond and seek help from a higher person.
Tony made 14L of lemonade for a party. His guests drank 9500 mL of the lemonade. How many milliliters of lemonade did tony have left?
Answers
1L = 1000ml
14L = 14000ml
14000-9500 = 4500ml left
Isabella's ballet class is preforming a spring recital for which they need butterfly costumes. Each butterfly costume is made from 3 3/5 yards of fabric. Use Distributive Property to find the number of yards of fabric needed for 5 costumes. (Hint: A mixed number can be written as the sum of an integer and a fraction.)
Answers
We are given that:
fabric required = 3 3/5 yards
costumes = 5
We can write fabric required as a fraction in the form of:
(3 * 5) + 3 = 18
fabric required = 18 / 5 yards
So total fabric required is = (18 / 5 yards) * 5 = 18 yards
Answer:
18 yards
A cube has a side of 5 cm. it has a mass of 250 grams. the density of the cube is
Answers
volume cube = side^3 = 5^3 = 125 cm^3, don't forget units!
Density = 250 grams / 125 cm^3 = 2 g/cm^3, with all the units
The density of the cube is calculated to be 2 g/cm³ by dividing the mass (250 grams) by the volume of the cube (125 cm³).
Explanation:To calculate the density of a substance, you divide its mass by its volume. In the given problem, the cube has a mass of 250 grams and each side of the cube is 5 cm. The volume of a cube is calculated by taking the cube of the side length, which in this case is 5^3 = 125 cm³.
By substituting the given mass and computed volume in the formula, we find that the density of the cube is 250 grams ÷ 125 cm³ = 2 g/cm³.
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You have $20 to spend on taxi fare. The ride costs $5 plus $2.50, per mile.
Answers
In this situation a good method would be to make an equation.
Let x represent the number of miles traveled.
The ride costs $2.50 per mile, so the cost of the total trip is equal to 2.5x + 5. (the 5 is the base 5$ cost)
Set this equation equal to 20 as you have $20 to spend.
So, we get
2.5x + 5 = 20
Subtract 5 on both sides to get:
2.5x = 15
Divide by 2.5 on both sides to find x.
x = 6
You can travel 6 miles in the taxi.
In exercises 83–86, verify that the intermediate value theorem applies to the indicated interval and find the value of guaranteed by the theorem.
Answers
83.
Given
[tex]f(x)=x^2+x-1[/tex]
on the interval [0, 5], with f(c) = 11
[tex]f(0)=0^2+0-1=-1[/tex]
and
[tex]f(5)=5^2+5-1=25+4=29[/tex]
Clearly, f(c) = 11 is between f(0) = -1 and f(5) = 29
Thus, the intermediate value theorem is satisfied.
To find the value of c, we solve the equation
[tex]c^2+c-1=11[/tex]
as follows:
[tex]c^2+c-1=11 \\ \\ c^2+c-12=0 \\ \\ (c-3)(c+4)=0 \\ \\ c=3 \ or \ -4[/tex]
Because, c is in the interval [0, 5], therefore, the value of c is 3.
84.
Given
[tex]f(x)=x^2-6x+8[/tex]
on the interval [0, 3], with f(c) = 0
[tex]f(0)=0^2-6(0)+8=8[/tex]
and
[tex]f(3)=3^2-6(3)+8=9-18+8=-1[/tex]
Clearly, f(c) = 0 is between f(0) = 8 and f(3) = -1
Thus, the intermediate value theorem is satisfied.
To find the value of c, we solve the equation
[tex]c^2-6c+8=0[/tex]
as follows:
[tex]c^2-6c+8=0 \\ \\ (c-4)(c-2)=0 \\ \\ c=4 \ or \ 2[/tex]
Because, c is in the interval [0, 3], therefore, the value of c is 2.
85.
Given
[tex]f(x)=x^3-x^2+x-2[/tex]
on the interval [0, 3], with f(c) = 4
[tex]f(0)=0^3-0^2+0-2=-2[/tex]
and
[tex]f(3)=3^3-3^2+3-2=27-9+1=19[/tex]
Clearly, f(c) = 4 is between f(0) = -2 and f(3) = 19
Thus, the intermediate value theorem is satisfied.
To find the value of c, we solve the equation
[tex]c^3-c^2+c-2=4[/tex]
as follows:
[tex]c^3-c^2+c-6=0 \\ \\ (c^2+c+3)(c-2)=0 \\ \\ c=2[/tex]
Therefore, the value of c is 2.
86.
Given
[tex]f(x)= \frac{x^2+x}{x-1} [/tex]
on the interval [tex]\left[ \frac{5}{2}, \ 4\right] [/tex], with f(c) = 6
[tex]f\left(\frac{5}{2}\right)= \frac{\left(\frac{5}{2}\right)^2+\left(\frac{5}{2}\right)}{\left(\frac{5}{2}\right)-1}= \frac{ \frac{25}{4}+ \frac{5}{2} }{ \frac{3}{2} } = \frac{35}{4} \cdot \frac{2}{3} =5 \frac{5}{6} [/tex]
and
[tex]f(4)= \frac{4^2+4}{4-1}= \frac{ 16+ 4 }{ 3 } = \frac{20}{3}=6 \frac{2}{3}[/tex]
Clearly, f(c) = 6 is between [tex]f\left(\frac{5}{2}\right)= 5 \frac{5}{6} [/tex] and [tex]f(4)=6 \frac{2}{3}[/tex]
Thus, the intermediate value theorem is satisfied.
To find the value of c, we solve the equation
[tex]\frac{c^2+c}{c-1}=6[/tex]
as follows:
[tex]c^2+c=6(c-1)=6c-6 \\ \\ \Rightarrow c^2-5c+6=0 \\ \\ \Rightarrow(c-2)(c-3)=0 \\ \\ \Rightarrow c=2 \ or \ 3[/tex]
Because, c is in the interval [tex]\left[ \frac{5}{2}, \ 4\right] [/tex], therefore, the value of c is 3.
Find the slope of each of the lines below:
Answers
The slope is "Undefined".
If a distribution is normal with mean 8 and standard deviation 2, then the median is also 8. True or false?
Answers
I hope this is correct :)
The Porter family is moving from Baltimore, Maryland, to San Francisco, California. They would like to know what the difference will be in their family budget. How would you explain cost of living to them?
Answers
Answer:
Cost of living is the amount of money needed for fixed expenses such as housing, food, taxes, and health care, as well as variable expenses. Big cities tend to have a higher cost of living than smaller cities.
Step-by-step explanation:
1. find the LCD of 3/5 and 1/6.
A. 5
B. 6
C. 11
D. 30
2. what is the difference between 3/7 and 1/14.
A. 1\2
B. 4/14
C. 5/14
D. 9/14
3. if Sandy's cookie recipe calls for 1/3 cup of brown sugar and she increases it by 2/9 of a cup, how much brown sugar does she use?
A. 7/9 cup
B. 5/9 cup
C. 4/9 cup
D. 1/9 cup
4. what value could be added to 2/15 to make the sum greater than 1/2?
A. 1/15
B. 8/30
C. 5/15
D. 8/15
5. which set of mixed numbers has a difference less than 1?
A. 1 2/9, 1 1/9
B. 3 4/7, 2 1/7
C. 2 4/5, 1 1/3
D. 2 7/9, 1 1/3
Answers
2. 3/7 - 1/14 = 6/14 - 1/14 = 5/14
3. 1/3 + 2/9 = 3/9 + 2/9 = 5/9
4. 8/15
5. 1 2/9 - 1 1/9
Answer:
1. D. 30
2. C. [tex]\frac{5}{14}[/tex]
3. [tex]\frac{5}{9}[/tex]
4. D. [tex]\frac{8}{15}[/tex]
5. A. [tex]\frac{12}{9}, \frac{11}{9}[/tex]
Step-by-step explanation:
1. LCD or lowest common denominator for a set of fractions is lowest common multiple of all the denominators in that set of fractions
∴ for [tex]\frac{3}{5}[/tex] and [tex]\frac{1}{6}[/tex] LCD will be 5×6 = 30
2. [tex]\frac{3}{7} - \frac{1}{14} = \frac{6-1}{14} = \frac{5}{14}[/tex]
3. [tex]\frac{1}{3} - \frac{2}{9} = \frac{3+2}{9} = \frac{5}{9}[/tex] = [tex]\frac{5}{9}[/tex]
4. [tex]\frac{2}{15} + \frac{1}{15} = \frac{1}{5}\\\\\frac{2}{15} + \frac{8}{30} = \frac{2}{5}\\\\\frac{2}{15} + \frac{5}{15} = \frac{7}{15}\\\\\frac{2}{15} + \frac{8}{15} = \frac{2}{3}[/tex]
5. [tex]\frac{12}{9} - \frac{11}{9} = \frac{1}{9} \\\\\frac{34}{7} - \frac{21}{7} = \frac{13}{7} \\\\\frac{24}{5} - \frac{11}{3} = \frac{17}{15}\\\\\frac{27}{9} - \frac{11}{3} = \frac{-6}{9}[/tex]
Going to be getting a tutor soon but until then I need all the help I can get.
Any help appreciated!
Answers
DFB is obtuse
CFD is a right angle
Rotation
Translation
Reflection