Is the difference of two rational numbers always rational? Explain

Answer:

(i)   [tex]x\leq 5[/tex]

(ii)   [tex]x\geq 5[/tex]

(iii)  [tex]x>5[/tex]

(iv)  [tex]x<5[/tex]

Step-by-step explanation:

(i) Two less than [tex]\frac{3}{2}[/tex] of a number (x) is no more than [tex]5\frac{1}{2}[/tex],

⇒ Two less than [tex]\frac{3}{2}[/tex] of x is less than equal to [tex]5\frac{1}{2}[/tex],

[tex]\implies \frac{3}{2}x-2\leq 5\frac{1}{2}[/tex]

[tex]\frac{3x-4}{2}\leq \frac{11}{2}[/tex]

[tex]3x-4\leq 11[/tex]

[tex]3x\leq 15[/tex]

[tex]\implies x\leq 5[/tex]

(ii) The sum of two times a number (x) and -2 is at least 8,

[tex]\implies 2x+(-2) \geq 8[/tex]

[tex]2x-2\geq 8[/tex]

[tex]2x\geq 10[/tex]

[tex]x\geq 5[/tex]

(iii) Seven subtracted from 4 times a number (x) is more than 13,

[tex]\implies 4x-7>13[/tex]

[tex]4x>20[/tex]

[tex]\implies x>5[/tex]

(iv) Four added to 3 times a number (x) is less than 19.

[tex]3x+4<19[/tex]

[tex]3x<15[/tex]

[tex]\implies x<5[/tex]

Answer with Step-by-step explanation:

273 students responded to a survey asking whether a Bulldog, a Lion, or a Tiger should be a new school mascot.

Let t students chose tiger

b students chose bulldog

and l students chose lion

then, t+b+l=273

Four times as many students chose Bulldog as chose Tiger.

i.e. b=4t

Twice as many students chose Lion as chose Tiger.

i.e. l=2t

So, t+4t+2t=273

i.e. 7t=273

Dividing both sides by 7, we get

t=39

Number of students who chose lion=2t

                                                           = 2×39

                                                           = 78

Hence, Correct option is:

B) 78 students

The correct representation of forty and eight tenths as a decimal is 40.8.

Here's an explanation for each option:

48.1: This representation is incorrect because it implies forty-eight and one tenth, not forty and eight tenths.

40.8: This is the correct representation. It means forty whole units (40) and eight tenths (0.8).

40.08: This representation is incorrect because it implies forty whole units (40), eight hundredths (0.08), and no tenths.

40.008: This representation is incorrect because it implies forty whole units (40), eight thousandths (0.008), and no tenths.

Therefore, the correct representation of "forty and eight tenths" as a decimal is 40.8.

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Final answer:

To find the total number of people at the mall, we calculate that 2500 represents 40% of the total. Dividing 2500 by 0.40 gives us the total number of people, which is 6250.

Explanation:

Jess observed that 60% of the people at the mall on a particular day shopped for clothes. If 2500 people at the mall did not shop for clothes that day, we can calculate the total number of people who were at the mall. Since 60% is the percentage that shopped for clothes, then 40% represents the percentage that did not shop for clothes. This means that the 2500 people constitute 40% of the total number of people at the mall.

To find the total number of people, we can set up the equation: 40% of total people = 2500. Translating percentages into decimals (40% = 0.40), the equation becomes 0.40 × total people = 2500. To solve for the total number of people, we divide 2500 by 0.40:

Total people = 2500 ÷ 0.40

Total people = 6250

Therefore, the total number of people at the mall that day was 6250.

Excel formulas are expressions used to perform computation.

The Excel formula to enter in cell D5 is = ROUND(B5/B4, 4)

From the question, we have:

The quotient of cells B5 and B4 is represented as:

B5/B4

To round the quotient, we make use of the ROUND function

So, we have:

ROUND(B5/B4, 4)

Excel formulas begin with the "=" sign

This gives

= ROUND(B5/B4, 4)

Hence, the Excel formula to enter in cell D5 is = ROUND(B5/B4, 4)

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3(a+b+b)^2 =

3(2+3+4)^2 =

3(9)^2=

3*81 =243

Answer:

A) Gretchen and her friend have to talk 3 hours before the temperature become equal.

B) The temperature after 3 hours will be 75°F.

Step-by-step explanation:

Current temperature in Florida = 69°F

Rate at which temperature is rising = 2°F per hour

Current temperature in Indiana = 84°F

Rate at which temperature is falling= 3°F per hour

A) Suppose in x hours both places have same temperature:

[tex] 69^oF +2F^o\times x=84^oF-3^oF\times x[/tex]

[tex]5x=84^oF-69^oF[/tex]

x = 3 hours

Gretchen and her friend have to talk 3 hours before the temperature become equal.

B) The temperature after 3 hours:

x  = 75°F

[tex]69^oF +2F^o\times x=69^oF +2F^o\times 3=75^oF[/tex]

48.24 total

 divide this by 12  to get the monthly average

48.24 / 12 = 4.02 inches per month

Final answer:

Calculate the amount of salt in a tank given rates of inflow and outflow, and determine the final salt quantity when the tank is full.

Explanation:

A 30-gallon tank initially contains 15 gallons of salt water containing 6 pounds of salt.

Find the initial amount of salt per gallon in the tank: 6 pounds / 15 gallons = 0.4 pounds per gallon.

Calculate the rate of salt being added and leaving the tank: In: 1 pound per gallon × 2 gallons per minute = 2 pounds per minute; Out: 0.4 pounds per gallon × 1 gallon per minute = 0.4 pounds per minute.

Subtract the rate of salt leaving from the rate of salt coming in to find the net rate of salt accumulation: 2 pounds per minute - 0.4 pounds per minute = 1.6 pounds per minute.

How much salt is in the tank when it is full?

Using the net rate of salt accumulation, calculate the time needed to fill the tank: 30 gallons / 2 gallons per minute = 15 minutes.

Finally, calculate the total amount of salt in the tank when full: 15 minutes × 1.6 pounds per minute = 24 pounds of salt.

A whole number with 4 digits is always greater than a whole number with 3 digits because each position to the left in a decimal number is ten times greater than the one to the right, making the smallest 4-digit number, 1000, larger than the largest 3-digit number, 999.

A whole number with 4 digits is always greater than a whole number with 3 digits. This is because the value of a digit in a number is determined by its position or place value. In our decimal number system, each digit to the left is ten times greater than the one to its immediate right.

For example, the smallest 4-digit number is 1000. The largest 3-digit number is 999. Clearly, 1000 (which has the smallest possible value for a 4-digit number) is greater than 999 (which has the largest possible value for a 3-digit number), hence a 4-digit number is always greater than a 3-digit number.

When considering significant figures, such as those that arise in measurements, certain digits are known exactly, while others may be more uncertain due to rounding or measurement limitations. However, this does not affect the overall rule that more digits in a whole number represent a greater value.

The quadratic equation with roots -1 and 3 and a leading coefficient of 1 is: [tex]f(x) = x^2 - 2x - 3[/tex]

To write a quadratic equation with roots -1 and 3, we can use the factored form of a quadratic equation:

A quadratic equation in factored form looks like this:

[tex]f(x) = a(x - r1)(x - r2)[/tex]

where:

f(x) is the quadratic function,

a is the leading coefficient,

r1 and r2 are the roots of the quadratic equation.

Given the roots -1 and 3, the factored form of the quadratic equation is:

[tex]f(x) = a(x - (-1))(x - 3)[/tex]

Now, you mentioned that the leading coefficient (a) is 1. So we can rewrite the equation as:

[tex]f(x) = 1(x + 1)(x - 3)[/tex]

Now, we can expand the equation to its standard form:

[tex]f(x) = (x + 1)(x - 3)[/tex]

Using the FOIL method (First, Outer, Inner, Last):

[tex]f(x) = x^2 - 3x + x - 3[/tex]

Simplify:

[tex]f(x) = x^2 - 2x - 3[/tex]

So, the quadratic equation with roots -1 and 3 and a leading coefficient of 1 is: [tex]f(x) = x^2 - 2x - 3[/tex]

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Final answer:

To determine how long it takes to eat 16 apples at the same rate as 8 apples in 15 minutes, set up a proportion and solve for the time.

Explanation:

This question demands basic understanding of ratio and proportion in general.

To find out how long it takes to eat 16 apples at the same rate Ritz eats 8 apples in 15 minutes, you can set up a proportion:

8 apples / 15 minutes = 16 apples / x minutes

8/15 × 1/16 = 1/x

1/15 × 1/2 = 1/x

1/x = 1/30

X = 30

To find the interest rate, you can use the formula R = I / (PT). In this case, the principal is $2000, the time is 4 years and the interest is $240, resulting in an interest rate of about 3%.

The subject of this question falls under Mathematics, specifically, financial mathematics, which deals with concepts like interest. The principle here is the initial amount of money that was deposited or borrowed. In this case, the principal is $2000. The time, in this scenario, is 4 years and the interest earned over this period is $240.

To answer the question, we'll use a formula for simple interest, expressed as I = PRT (where 'I' stands for the interest, 'P' is the principal, 'R' is the rate of interest and 'T' is the time in years). To calculate the interest rate, we rearrange the formula to R = I / (PT). Here, R would equal $240 / ($2000 x 4).

So, the interest rate (R) would be approximately 3%.

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Answer:

  input: number of rowers in the rowboat; output: speed of the rowboat

Step-by-step explanation:

took the test and this was correct