Mathematics Middle School

Which expression is equivalent to the following?
21x – 15

A. 3(2x)
B. 3x(7x – 5)
C. 3(7x – 5)
D. 3(7x – 15)

Answers

Answer 1
C. 3(7x-5) 

Hope this helps. Plz give Brainliest! :) 
Answer 2
Hello,


Your answer is C. 3(7x – 5) , this is the equivalent fraction!


Hope this helps

Related Questions

A cube has edge length 5in use a exponent to express volume

Answers

5 cubed ( or an exponent of three )
What exponents do you know that share names with different kinds of shapes? It may surprise you (or not) to discover that taking the square of a number and taking the cube of a number both derive their names from finding the space inside a square and a cube respectively. For squaring (as in x²) this corresponds to calculating the area of a square with side lengths x. For cubing (as in x³), it corresponds to calculating the volume of a cube with edge lengths x.

So, if we want to find the volume of a cube with edge length 5 in, we just need to find the value of 5³. (Keep in mind that our final units will be in in³)

luca has 72 baseball cards. this is 8 times as many as han has.how m

Answers

If Luca has 72 baseball cards, Han has 9 baseball cards. 
Han has 9 Basball card.
9 x 8 (8 times as many) = 72 cards (lucas cards)

what is 20 by the power of 5

Answers

The answer would be 3200000
yup it's 3200000, I have to extend this in order for it to allow me to post it so it thinks I'm explaining the answer when in reality it's just 20*20*20*20*20 :)

find the number if 10.6% of it is 20% of 106?

Answers

Please rewite your question so it makes sence

Answer:200

Step-by-step explanation:

Which form of investment has the most amount of risk involved?

Answers

I think the correct answer among the choices listed above is the third option. Mutual fund is a form of investment which has the most amount of risk involved. This is because you do not solely own the account and it is not a secured type which is not covered by insurance.

I believe it would be mutual fund investment.
Hope it helps!

The table shows the cost (in cents) of producing and distributing each coin for two years.

Quarter- 4.38 in 2000, 9.78 in 2007
Dime- 1.92 in 2000, 4.09 in 2007
Nickel- 3.16 in 2000, 9.53 in 2007
Penny- 0.82 in 2000, 1.67 in 2007

Part A) Which coins costs less to make than they are worth? Which coins cost more than they are worth?
Part B) How much more does it cost to produce 50 of each coin in 2007 than in 2000?

Plz help!!! Due tomorrow!!

Answers

part a, penny, quarter and part b, 759.98
Final answer:

In 2000 and 2007, quarters and dimes cost less to produce than they are worth while nickels and pennies cost more in 2007. The increased cost to produce 50 of each coin in 2007 vs 2000 can be calculated by multiplying the increase in production cost for each coin by 50 and summing up the totals.

Explanation:

In Part A, you're asked to compare the face value of each coin to its production cost. For a quarter, the face value is 25 cents which is higher than the production cost of 4.38 cents in 2000 and 9.78 cents in 2007. This is true for the dime as well, face value of 10 cents compared to production costs of 1.92 cents in 2000 and 4.09 cents in 2007. Hence, quarters and dimes cost less to make than they are worth. Nickel and Penny cost more than they are worth in 2007 since their production cost exceeds their face value (5 cents for Nickel and 1 cent for Penny).

For Part B, you need to calculate the difference in the production cost for each coin between 2007 and 2000, and then multiply that by 50. For example, the cost for a quarter increased by 5.4 cents from 2000 to 2007 (9.78-4.38). Multiplied by 50, that's an increase of 270 cents (or $2.70). Do the same for each coin and sum up all the increases to get the total increased cost for 50 of each coin.

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Need help with two math problems please.

Answers

18) B. 3/8 cups
20) B. Day 2

Simplify negative 3 over 4 divided by 2 over negative 8

A: -6
B:-3
C:3
D:6

Answers


[tex] - \frac{3}{4} \div ( - \frac{2}{8} ) \\ = - \frac{3}{4} \times ( - \frac{8}{2} ) \\ = 0.75 \times 4 \\ = 3[/tex]
so it's C)

Answer:

The answer is C

I need help ASAP i'm doing math and we are do Addition with mixed numbers

A chemist mixes 2 3/5 g or an element and 16 4/9 g of another element. When the two are mixed,what is the total mass in simplest form?

A) 18 1/2 g
B) 18 2/45 g
C) 19 2/45 g
D) 18 1/4 g

Answers

You can add the whole numbers as is.

2 + 16 = 18

Add the fractions with the same denominator.

Find the common denominator between 5 and 9.

The common denominator should be 45.

Write both fractions with a denominator of 45.

3/5 → 27/45

4/9 → 20/45

Add the new fractions as is:

27/45 + 20/45 = 47/45

Write 47/45 as a mixed fraction.

47/45 → 1 2/45

Add both the whole number and the mixed fraction.

18 + 1 2/45 = 19 2/45

Solution: C) 19 2/45g

The answer is 19 and 2 45ths g trust me this is the answer

Step-by-step explanation:

Find the midpoint of QP

Answers

(-2,-1).. . . . . . . . . . . . . . . . . . . . . . . ... . . . .. . . . . .. . . . ..

an aquarium holds 6 1/4 gallons of water the water level dropped to 4/5 of this amount how much water should be added to fill the aquarium

Answers

The answer is 1.25 gallons or 5/4 gallons

solve for f f+0.2=−3

a. f= -3.2
b. f= -2.8
c. f=2.8
d.f=3.2

Answers

The answer is A. You have to isolate the variable(f) by subtracting 0.2 from both side. When youve done that, the answer should be -3.2

Answer:

f = -3.2

Step-by-step explanation:

Which statements about opposites are true?

Select each correct answer.

The opposite of a number is always a negative number.

The opposite of the opposite of a number is the number itself.

A non-zero number and its opposite are located on opposite sides of zero on a number line.

The opposite of a number is 1 divided by that number.

Answers

The opposite of the opposite of a number is the number itself.
Final answer:

The opposite of a number is the same distance from zero on the number line but on the other side. Therefore, the opposite of a number is not always negative, the opposite of the opposite of a number is the number itself, and non-zero numbers and their opposites are on opposite sides of zero. The reciprocal of a number (1 divided by that number) is not its opposite.

Explanation:

In the realm of mathematics, the term 'opposite' refers to the number that is the same distance from 0 on the number line, but on the other side. With this definition, we can state that:

The opposite of a number is not always a negative number. For example, the opposite of -7 is 7, which is positive.The opposite of the opposite of a number is indeed the number itself. For instance, the opposite of -3 is 3, and the opposite of 3 is -3.A non-zero number and its opposite are indeed located on opposite sides of zero on a number line.The opposite of a number is not 1 divided by that number - this is actually the reciprocal of a number, not its opposite.

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Please help me with math please, they are number lines

Answers

The ccorrect answer is C

Jim drove 153 miles in 3 hours. If he can keep the same pace, how long will it take him to drive 1377 miles?

Answers

9 hours is how long to get to 1377 miles

Tyson and his friends go ice skating. Tyson must pay an initial fee of $18.30 plus $4.80 per hour. Write an equation for the cost (c)Tyson must pay after ice skating (h)hours. Solve the equation to find the cost to go ice skating for 4 hours. Write your answer as an ordered pair.

1. c= 18.30 + 4.80h (4,37.50)
2. c= 18.30 +4.80 + h (4.27.10)
3. C= 4.80h - 18.30 (4,0.9)
4. C= 4.80 + 18.30h (4,78.00)

Answers

1.c=18.30+ 4.80h (4,37.50)
The correct answer would be the first one, though it is written out of order, it is correct

A 6-pound watermelon costs $2.40 before a 30% discount. Which equation would allow you to find the discounted price of the watermelon?

Answers

That equation would look like this:

2.4 - 2.4 * .3 = p

p = price
The unit price of watermelon is

$2.40
--------- = $0.40/lb.
  6 lb

The discounted price of the watermelon would be (1.00-0.30)($0.40)

= 0.70($0.40) = $0.28/lb

Write a real-word problem that gives extra information. Tell what that extra information is.


Best real-word problem I will mark as brainliest

Answers

Angela is 5 years older than Mikey. Mikey is 6 ft tall, weighs 140 pounds, and has size 14 shoes. Mikey is 2 years younger than Jake, who is 33 years old. How old is Angela?

Extra info is 6 ft tall, weighs 140 pounds, and has size 14 shoes.

Kara has a job as a cashier. She made $145 for two weeks of work. The next two weeks, she earned $135. She deposited $50 into her savings account, and bought a shirt for $15. She then made $135 again for the next two weeks. How much money did she make in all?

a. $330

b. $65

c. $395

triangles ABC and DEF are similar. what is the length of side EF

Answers

the anwser is either 2.88 or 3, But others are saying it is 3.

Answer:

The length of the side EF is 3cm.

Step-by-step explanation:

As both triangles are similar, their corresponding sides are in proportion.

This means that:

[tex]\frac{AB}{DE}=\frac{BC}{EF}=\frac{AC}{DF}[/tex]

[tex]\frac{3}{4.5}=\frac{2}{x}=\frac{5}{7.5}[/tex]

This proportion is called the scale factor.

Knowing this, we can find the value of x

[tex]\frac{3}{4.5}=\frac{2}{x}[/tex]

[tex]x=2 *(\frac{4.5}{3})=\frac{9}{3}=3cm[/tex]

So, the lenght of side EF is 3cm.

A hand-held digital music player was marked down by 1/4 of the original price.
a. If the sales price is $128.00, what is the original price?
b. If the item was marked up by 1/2 before it was placed on the sales floor, what was that the store paid for the digital player.?

Answers

A) you would divide $128 by 4, getting $32. then add that to the original price, being $160.
B) you would divide $160 by 2, getting $80, then add those two together in order to find what it was marked up to, being $240. hopefully this helps

Answer:

a) The original price of music player is $170.66

b)If the item was marked up by 1/2 before it was placed on the sales floor, the store paid $213.325 for the digital player.

Step-by-step explanation:

Let the original price be x

A hand-held digital music player was marked down by 1/4 of the original price.

So, Discount = [tex]\frac{1}{4}x[/tex]

So, Sale price =[tex]x-\frac{x}{4}=\frac{3x}{4}[/tex]

We are given that  the sales price is $128.00

So, [tex]\frac{3x}{4}=128[/tex]

[tex]x=\frac{128 \times 4}{3}[/tex]

[tex]x=170.66[/tex]

a) The original price of music player is $170.66

The item was marked up by 1/2 before it was placed on the sales floor.

So, Cost = [tex]170.66+\frac{1}{4} \times 170.66[/tex]

Cost = [tex]213.325[/tex]

b)If the item was marked up by 1/2 before it was placed on the sales floor, the store paid $213.325 for the digital player.

rationalize the denominator of square root -36 over (2-3i)+(3+2i)

Answers

-90 over 13 - 18i over 13

Sorry for such a late response, but for future reference the answer is b -6 + 30I OVER 26 is the correct answer

A train is traveling from New Orleans to Memphis at a constant speed of 79 mph. New Orleans and Tennessee are 395.1 miles apart. How long will the train will the train take to reach Tennessee? Round to the nearest tenth.

Answers

time = distance / speed
time = 395.1 / 79
time = 5.0 hrs
Final answer:

Using the formula 'Time = Distance / Speed', the train traveling from New Orleans to Memphis at a constant speed of 79 mph would take approximately 5.0 hours to cover the distance of 395.1 miles.

Explanation:

The subject of this task is about calculating travel time given a certain speed and distance. In this case, we have a train traveling from New Orleans to Memphis at a constant speed of 79 mph, and we're asked to find out how long it would take for the train to cover the distance of 395.1 miles between the two cities.

The principle used to find this is a basic mathematical concept involving time, speed, and distance, represented in this formula: Time = Distance/Speed. For this question, the distance is 395.1 miles and the speed is 79 mph.

Applying this information into the formula, the calculation becomes: Time = 395.1 miles / 79 mph = 5 hours. Rounded to the nearest tenth, the time it takes for the train to get to from New Orleans to Memphis at a constant speed of 79 mph is approximately 5.0 hours.

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please help me answer the range and domain for graph 1 & 2. thank you !

Answers

the domain is -5 I think but I don't belive  is true

Match each point with one of the following fractions: 5/6, 7/12, 1/8, 5/16

Answers

answer is B. second one

A = 1/8, B = 5/16, C = 7/12, D = 5/6
--------------
A for #1 
and B for #2
hope it helped!

Solve for y in the equation

5{2y+1}=4{5}y+1=15

Answers

nothing can be done with this equation unless you meant to put parenthesis. if you meant to put parenthesis then y= 1/2

when two pieces of rope are laid end to end they measure 40 meters. one is 10 meters longer than the other. how long is each piece of rope.

Answers

40-10=30

30/2 = 15

 one is 15 meters

 the other is 25 meters


40-10=30

30/2 = 15

One of them is 15 meters and the other is 25 meters.

A group of 4people share 1/2 pound of almonds how many pounds of almonds does each person get

Answers

0.125 pounds or 1/8 pound

Answer:

each person gets 1/8 pounds of almonds

Step-by-step explanation:

Four persons will divide ½ pound of almonds in four pieces, one piece for everyone, so translating this to an equation is:

X = [tex]\frac{1}{2}[/tex] ÷ 4

Where X represent how much of almonds will have everyone.

For divide fractional numbers we do a multiplication in cross, that means that the higher number in the first fraction will be multiplicated with the lowest number of the second fraction ( if the second number is not a fraction, we will assume that have a the number 1 is the lowest part) and the lowest number of the first fraction will be multiplicated with the highest number of the second number.

Then, we can rewrite the initial equation and solve as:

X= [tex]\frac{1}{2}[/tex] ÷ [tex]\frac{4}{1}[/tex]

[tex]X=\frac{1*1}{2*4} = \frac{1}{8}[/tex]

So, each person is going to get 1/8 pounds of almonds.

A large university accepts 70% of the students who apply. Of the students the university accepts, 35% actually enroll. If 10,000 students apply how many actually enroll?

Answers

2,450 students will actually enroll.

10,000*0.7[70%]
7,000 students accepted

7,000*0.35[35%]
2,450

Hello! So, the university accepts 70% of the 10,000!students that apply. 10,000 * 0.70 is 7,000. 35% of the 7,000 students that get accepted actually enroll. So now, we would have to do 7,000 * 0.35, which would give us 2,450. So 2,450 out of 10,000 students that apply to the university actually enroll. The answer is 2,450.

not sure! help! please

Answers

[tex] \dfrac{ \frac{x}{4} + \frac{1}{8} }{ \frac{x^2}{4} } = \vspace{3mm} = \dfrac{ \frac{2x}{8} + \frac{1}{8} }{\frac{x^2}{4}} \vspace{3mm} = \dfrac{ \frac{2x+1}{8} }{\frac{x^2}{4}} \vspace{3mm} = \dfrac{2x + 1}{8} \times \dfrac{4}{x^2} \vspace{3mm} = \dfrac{2x + 1}{2x^2}[/tex]

Which if these are least likely to describe a distance below sea level?
A. Whole number
B. Integer
C. Rational number
D. Real number
Thanks!

Answers

C. Rational numbers could be fractions and that's the least likely way to determine distance below sea level.

The whole numbers are least likely to describe a distance below sea level.

What is a whole number?

All the counting numbers starting from zero are called whole number. It is the number which is not represented in the form of a fraction.

Given that, what is least likely to describe below sea level,

Below sea level is a distance which is calculated in negative because it is a distance below the sea level.

A rational number can be negative or positive, hence, it can or can not describe the distance below sea level.

Integers are the collection of negative and positive numbers, so it can also describe above or below both the distance from sea level.

Real numbers are the numbers which are not imaginary and can be found on number scale, so it can be both negative or positive and hence can describe above or below both the distance from sea level.

Whole numbers are numbers starting from zero, and hence not includes negative numbers, therefore, a whole number can not describe the distance from below sea level.

Hence, the correct answer is whole number.

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