Mathematics Middle School

Loudness, or the intensity of sound, is measured in decibels. The sound level of a television is about 70 decibels, which is considered a safe hearing level. A food blender runs at 20 decibels higher than a TV, and a jet engine's decibel reading is 40 less than twice that of a blender. At this level, exposure can cause hearing loss. Find the intensity of the sound of a jet engine.

Answers

Answer 1
A jet engine runs at 140 decibles

Related Questions

If 2 and 4 each divide q without remainder which of the following must q divide without remainder

Answers

i would say that it is because the answer cannot be determined from the information given.

Find the extraneous solution of the equation |2x−10|=−3x

Answers

|2x - 10| = -3x
Open absolute value symbol
2x - 10 = 3x
OR
2x - 10 = -3x

x = -10
OR
x = 2

Plug them in...
|2(-10) - 10| = -3(-10)
30 = 30
x = -10 is not the extraneous solution.

|2(2) - 10| = -3(2)
6 ≠ -6
x=2 is the extraneous solution.
Have an awesome day! :)
Final answer:

For the equation |2x−10|=−3x, the absolute value cannot be negative, therefore there is no valid solution. Any solution derived would be considered an extraneous solution. Extraneous solutions are those that appear during the solving process but are not valid.

Explanation:

The given equation is a mathematical expression |2x−10|=−3x. However, it should be noted that the absolute value of a number cannot be negative, so technically, there is no solution to this equation. This means the equation doesn't have a valid solution, but rather an extraneous solution.

An extraneous solution often arises in the process of solving an equation but is not a true solution. They often appear when you square both sides of an equation, as this often introduces new solutions that weren't part of the original equation.

So, in this case, since the absolute value can not be negative, it is impossible for |2x - 10| to be equal to -3x. Hence, any solution derived from this equation would be considered an extraneous solution.

Learn more about Extraneous Solution here:

https://brainly.com/question/34838129

#SPJ2

here are 96 girls in a junior class of 176 students. Find the ratio of girls to boys.

Answers

176 - 96= 80

Meaning there's 80 boy in the class.

The unsimplified version of the ratio would be 80:96 or 80/96 in fraction form

But if your looking for it simplified it would be 5:6 or 5/6 in fraction form.

Hope this helps :)

Kai is making a chess board using pieces of wood that measure 1 in.². When he finishes, the chessboard will have an area of 64 in.². How many pieces of wood should he put along each side.

Answers

You have to find the square root of 64, since he is putting the same amount to both sides. The square root of 64 is 8, so Kai will be putting 8 pieces along each side. YOU'RE WELCOME :)

Answer:

8

Step-by-step explanation:

SungHee empties her piggy bank and finds that she has 200 quaters,150 dimes,and 300 pennies.How much money does she have?Explain

Answers

9,800 coins or somethin
thats what i got.

At a wedding reception, an equal number of guests were seated at 12 round tables. The 13 people in the wedding party were seated at a rectangular table. There were 121 people at the reception altogether. Which equation could you use to find the number of guests, n, seated at each round table?

Answers

12n + 13 = 121
-13 from both sides

12n = 108
÷12 from both sides

n=9

What value of x makes the equation below true? 6x-9 39

Answers

6x-9=39
+9 +9
6x=48
x=48/6
x=8
And yes it is true

how do i write a direct variation given that y varies directly with x
x: 15 y: -5

Answers

When we say that y varies directly with x, we mean that whatever value x is scaled up by, y will be scaled up by, too. The simplest kind of direct variation is one where y = x for all values of x. If you multiply x by some value, y must be multiplied by that same value.

More generally, though, you'll have something of the form y = kx, where the variable k here is referred to as the constant of proportionality. Another way you can think of k is as the ratio of y to x.

In this problem, you're given a set of values for x and y, and you'll need to use those to find the constant of proportionality before you set up an equation relating x to y. Substituting our general equation y = kx for the given values, we have:

-5 = k(15)

To get k, simply divide both sides by 15 to obtain:

k = -5/15 = -1/3

So, our general equation, for any x, would be y = (-1/3)x

21 is what percent of 42

Answers

21 is 50% of 42. 
42 x 0.5 = 21
1. We assume, that the number 42 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 42, so we can write it down as 100%=42.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=42
2) x%=21
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=42/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21 is what percent of 42

100%/x%=42/21
(100/x)*x=(42/21)*x       - we multiply both sides of the equation by x
100=2*x       - we divide both sides of the equation by (2) to get x
100/2=x
50=x
x=50

now we have:
21 is 50% of 42

Carmelo puts $2,200.00 into savings bonds that pay a simple interest rate of 3.4%. How much money will the bonds be worth at the end of 5.5 years?

Answers

Hello there! So, the first thing we do when solving these types of problems is to find the interest rate. Because this is simple interest, the amount earned will be constant. The formula for this is I = prt. The principle is the $2,200. The rate earned per year is 3.4%. 2,200 * 3.4% (0.034) is 74.80. That's $74.80 worth of interest each year. The amount of time is 5.5 years. 74.8 * 5.5 is 411.4. Carmelo will earn $411.40 worth of interest in 5.5 years. However, that's not all. We are looking for the total amount of his bonds, which means add the interest and his initial amount in the bank. 2,200.00 + 411.40 is 2,611.4. Carmelo's saving bonds will be worth $2,611.40 at the end of 5.5 years.

The bonds will be $2611.40 at the end of 5.5 years.

What is simple interest rate?

Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments.

Simple interest rate formula

F.V = [tex]P.V (1+rt)[/tex]

F.V = Final value

P.V = Principal value

Given

Principal value P.V = $2200.00

Rate r = 3.4%

Time t = 5.5 years

Simple interest rate formula

F.V = [tex]P.V (1+rt)[/tex]

F.V = [tex]2200(1+3.4 \% \times 5.5)[/tex]

F.V = [tex]2200(1+0.034 \times 5.5)[/tex]

F.V = 2200 × 1.187

F.V  = 2611.40

Hence,

The bonds will be $2611.40 at the end of 5.5 years.

Find out more information about simple interest rate here

brainly.com/question/7279636

#SPJ2

Fifteen children voted their favorite color. The votes for red and blue together were double the votes for green and yellow together.How did the children vote?

Answers

5 green and yellow, ten red and blue
15, = 5 x 3 = 3 groups of five children of,  5 groups of 3 children, They voted in groups, their were no doubles.

Which sets of values can be the measures of the exterior angles of a triangle?
120°, 110°, 130°

35°, 103°, 122°

123°, 87°, 220°

120°, 120°, 120°

123°, 157°, 90°

can be more than one answer

Answers

The 3 angles must add up to 360 degrees

Only 1 and 4  fit the bill.

When is A divided by B equal to an integer? Explain please.

Answers

Can't see all the options. 

However, I'll guess and suggest B.

Not sure if this helped at all :P

A function is shown below:

f(x) = (0.07)x

What does the function represent?
A. Exponential growth of 7%
B. Exponential decay of 7%
C .Exponential growth of 93%
D. Exponential decay of 93%

Answers

the function represents an exponential decay of 93%, as the number will enormously decrease in 0.93.

Answer:

D. Exponential decay of 93%

Step-by-step explanation:

We are given an exponential function [tex]f(x) = (0.07)^x[/tex].

We know, the standard exponential function [tex]y= a(b)^x[/tex], where a is the initial value and b is growth factor.

If b is greater than 1, then it would be an Exponential growth and if  b is less  than 1, then it would be an Exponential decay.

Also b= 1+r,  where r is the rate of decay or growth.

For the given function [tex]f(x) = (0.07)^x[/tex], we can see than b= 0.07.

0.07 is less than 1.

Therefore, it would be an Exponential decay.

Now, let us find rate of decay.

1+r = 0.07.

Subtracting both sides by 1, we get

r = 0.07-1 = -0.93.

In percentage it would be 93%.

Therefore, correct option would be

D. Exponential decay of 93%

Monisha and Dave each sold more magazine subscriptions as part of a fundraiser Monisha rays have as much money as the rays together the race $213.75 what is the total amount of money the money she has raised

Answers

Monisha = x/2

Dave = x

x + (x/2) = 213.75

1. Solve for x.

2. Evaluate x/2 to find the total amount raised by Monisha.

Take it from here.

Julie has a bag of p blue marbles and q red marbles in the ratio 2:3. She adds r blue marbles. The ratio of blue marbles to red marbles is now 2:1. What is the ratio between p and r

Answers

I'm not sure how to answer the question... BUT, I know that the side that says 2 is for the blue marbles and 1 is for the red marbles, meaning that every 2 blue marbles she has equal 1 red marble. 
Sorry I didn't have the answer, hope this helps :/

simplify
7x + 8 = 36

Answers

7x=36-8
7x=28
x=28/7
x=4

The correct simplification of [tex]7x + 8 =36[/tex]  for value of x is 4.

Given expression is:

[tex]7x+8 = 36[/tex]

To simplify the expression,

isolate  [tex]x[/tex] on one side of the expression or rearrange the expression rearranging like and unlike terms.

Subtract 8 from both side of the expression:

[tex]7x + 8 -8 = 36 -8[/tex]

[tex]7x = 36-8[/tex]

[tex]7x = 28[/tex]

To solve for [tex]x[/tex] , Divide both side of the equation by 7.

[tex]\dfrac{7x}{x} = \dfrac{28}{7}[/tex]

[tex]x = \dfrac{28}{7}[/tex]

Simplify further,

[tex]x = 4[/tex]

The solution for the  equation  [tex]7x + 8 =36[/tex] is 4.

Learn more about simplification here:

https://brainly.com/question/24140794

#SPJ6

Graph y-5=-2/3(x+9)
50 points !!!

Answers

Here is the graph. A way you could graph this is notice how this equation is in point-slope form.

A line that passes through (x1, y1) and has slope m
y - y1 = m(x - x1)

Using the equation, you could find out that the line has a slope of -2/3 and passes through the point  (-9,5).

Have an awesome day!

In a class of 160 students, 90 are taking math, 78 are taking science, and 62 are taking both math and science. What is the probability of randomly choosing a student who is taking only math

Answers

The probability of choosing a student who is taking only math from a class of 160 students, with 90 taking math and 62 taking both math and science, is 0.175.

The question asks for the probability of randomly choosing a student who is taking only math in a class of 160 students, where 90 are taking math, 78 are taking science, and 62 are taking both math and science. To find the number of students taking only math, subtract the number of students taking both subjects from the total number taking math (90 - 62 = 28). The probability is then the number of students taking only math divided by the total number of students, which is 28/160.

The probability can be calculated as 28 divided by 160, or 0.175.

a story problem for 7 ×6=42

Answers

Bob goes to the store 7 times a week and buys 6 watermelons each time he goes. How many watermelons does Bob buy in one week?

Sara is multiplying two factors,one with one decimal place and one with two decimal places.She says that the product could have two decimal places. is she correct?

Answers

She is incorrect, the product will have 3 decimal places.

solve each equation x-6=8

Answers

Equation is
x-6=8
x=8+6
x=14
X equal to 14

The solution to the equation  x - 6 = 8 is x equal to 14.

What is a numerical expression?

A numerical expression is a mathematical statement written in the form of numbers and unknown variables. We can form numerical expressions from statements.

Given, An expression x - 6 = 8.

Now, Separating the variable and constants by moving them to other sides

we have, x = 8 + 6.

x = 14.

Also moving terms to the other sides changes its sign.

learn more about numerical expressions here :

https://brainly.com/question/29199574

#SPJ5

Is it possible to divide 15 by a mixed number an get a quotient greater than 15

Answers

If the mixed number can be anything less than 1 then sure, but I don't think 0 can be the whole number part of a mixed number, or at least I've never seen it
no you cannot because you are dividing a number greater than one.

Bella uses 56 beats to create a necklace.she wants to make 23 necklaces for a craft show. unfortunately,she was 15 beads short and cannot finish the last necklace.how many beads did she start with?

Answers

To find how many she started with do 56 x 23 - 15

If 1 liter = 1.057 quarts, how many quarts are in 1 kiloliter?

Answers

1 Liter = 1.057 quarts 1 kiloliter is 1000 liter = 1057 quarts.
The answer may be 10000

Determine the amount potential energy of 5.0kg book that is moved to three different shelves on a bookcase. The height of each Shelf is 1.0 m, 1.5

Answers

p. e = mgh
m=5kg
g=10ms-²
h=1 + 1.5 + (you didn't specify the third shelf height) i assume it is 2m
so total = 1+1.5+2= 4.5
p. e = 5×10×4.5 = 225joules

What is LCD of the fraction 1/3 and 3 1/4

Answers

LCD = 12
Thanks (:
!!!!!!!!
Answer:  The LCD (lowest common denominator) of the fractions "1/3" and "1/4" is:  "12" .
_____________________________________________________

help??????

Referring to the Fig. in Question #19, write the equation in standard form of the horizontal line through the point (3,0).

Answers

You'll have to supply Question 19.

Answer:

the answer is y=0

Step-by-step explanation:

What do the numbers listed for an element on the periodic table represent?

The smaller number is the mass, and the greater number is the atomic number.
The smaller number is the number of protons, and the greater number is the mass.
The smaller number is the number of neutrons, and the greater number is the number of electrons.
The smaller number is the number of neutrons, and protons and the greater number is the number of electrons.

Answers

Im sure you have your answer by now but would you mind posting the answer

Answer:

The smaller number is the atomic number or the number of protons and the larger number is the atomic mass.

Explained:

The number with a lower value is the number of protons and the number with a higher value is the mass.

 

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties.

 

The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

What is the probability that two events, A and B, will occur at the same time?

answer choices:
P(A or B)


P(A and B)


P(A)+P(B)

Answers

P (A and B) is the answer for this question, unless the question asks 'not the same time' Then your answer would be P(A or B).
Other Questions
If P is the midpoint of XY,XP=8x-2 and PY=12x-30 find the value X What is a major risk posed by the increasing concentration of media ownership? Almost ____ percent of the never-married tell pollsters that they do want to marry. Plz help me with my english hw Can someone help me? (Algebra 1) When kristen wiig first arrived in l.a. she was part of an improvisational comedy troupe whose name is taken from what shakespearean play? Quiero limpiar la cocina _______ no tengo tiempo. Jared Harless shattered his elbow in a snowboarding accident and decided to visit a doctor at Smith Union Hospital for treatment. While at the hospital, he interacts with many individuals who attempt to make his experience at the hospital a positive one. In most large organizations, several people are responsible for the buying decisions. These buying center participants can include employees who have a formal role in purchasing decisions (i.e., the purchasing or procurement department), members of the design team for a new product, top managers, and employees who will be using the item being purchased. These employees are likely to play different roles in the buying process. Vendors must understand these roles and adapt the marketing process appropriately for different individuals and for the buying center as a whole. Four of the trans-neptunian objects, with their orbital eccentricities, are listed. which one has the most eccentric (most elongated, least round) orbit? Who were the Sumerians How many miles did native americans march on the trail of tears? How many valence electrons are in c4h6br2? What is the correct mla format for a work cited page entry for a magazine article What actually took place during Pontiacs War? Please Help :/ Which most accurately describe the involvement of the Catholic Church in the Crusades? (Select all that apply.) After 100 years of fighting over Jerusalem, the Catholic Church also waged war in Europe against Christians who did not follow Catholicism. Protestants led by Martin Luther used a campaign called the Crusades as a way to break free from the Catholic Church. The Knights Templar were an order of crusaders approved by the pope and ordered to protect Christian pilgrims traveling to the Holy Land. The Crusades was a term used by the Eastern Orthodox Church to describe its schism from the Roman Catholic Church. A real number greater than or equal to 5.5 A computer ____ is malicious computer code that reproduces itself on the same computer.a. wormb. adwarec. virusd. spyware Please respond to the following in Spanish: Name three things that you can do to protect yourself, property, family, and pets from a severe weather event. When entering your answers for fill in the blank and essay questions, please be sure to use accent marks and/or correct punctuation to avoid your answer being marked incorrect. You may copy and paste the accented character or punctuation mark from this list if needed: (5 points) Choose all answers that are correct. What are the personal pronouns in this sentence? The plants opened their buds, and they are beautiful. A. their B. they C. the D. and Ted made sure to slam the door as he left. He frowned as he stomped down the hallway. He didnt deserve this! He was the one who had come clean. If he hadnt told the principal about their plan to cheat on the math final, then they wouldnt have been able to prove anything. Why was he the only one getting into trouble? He shouldnt have confessed it at all! Ted was absolutely fuming. Which context clue in the passage shows how Ted was feeling? A. He confessed to the principal. B. He was the only one in trouble. C. He was planning to cheat on the math final. D. He slammed the door when he left the principals office. Steam Workshop Downloader