MATHEMATICS MIDDLE SCHOOL

The length of river a is 560 miles more than twice the length of river B. River A is also 1550 miles longer than river B. Find the lengths of river A and B.

Answers

Answer 1
Answer: River B is 990 miles and River A is 2,540 miles.
Answer 2
Answer: a = 2b + 560
a = b + 1550
----------------------
a - 2b = 560
a - b = 1550
---------------------
a - 2b = 560
-2(a - b = 1550)
------------------------
a - 2b = 560
-2a +2b = -3100
-a = -2540
a = 2540
-----------------------
2540 = b + 1550
2540 - 1550 = b
990 = b

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What is the percent of increase for a population that changed from 25,000 to 30,000?

How many Japanese yen are equal to $100?, $1,000?, $10,000?

Answers

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Grace has $100. She is buying charms for her bracelet that cost $5 each. Write an equation showing the relationship between the number of charms,c, she buys and the amount of money she has left,m.

Answers

The required equation is m = 100-5c.

What is an equation?

An equation is a mathematical statement that shows that two mathematical expressions are equal.

Given that, Grace has $100. She is buying charms for her bracelet that cost $5 each.

Let, she buys c charms for her bracelets,

Therefore, the equations become,

m = 100-5c

Where, m is money is she left with.

Hence, the required equation is m = 100-5c.

Learn more about equations, click;

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Amount of money she has left is 100 - 5x 
Number of charms she buys is $5x
x being the number of charms

Stacie paid $13.25 for new earphones. The price she paid included a sales tax of 6%.What was the price of the earphones before the tax was added?

A.
$12.46

B.
$12.50

C.
$13.19

D.
$14.05

Answers

Let us assume the original cost of the earphones = x dollars
Then
x * (106/100) = 13.25
x = 13.25 * (100/106)
   = 1325/106
   = 12.50 dollars
So the actual cost of the earphones was $12.50. The correct option among all the options that are given in the question is the second option or option "B".

6=4x+ 9y?

Solve for y

Answers

Answer:

I will need to know the value of x in order to solve for y.

Also, is 4x and 9y multiplied, added, etc...

Answer:

-4/9x+2/3=y

Step-by-step explanation:

6=4x+9y

bring 4x over to the left side of the equal sign

-4x+6=9y

now divide everything by 9

-4/9x+6/9=y

on a 15 hour trip, Rob drove 35% of the time and Mark drove the reminder of the time. how many hours did Mark dive?

Answers

Rob drove 5.25 hours so Mark drove 9.75 hours

15*35%= 5.25
15-9.25=9.75

Every week, Mr. Kirkson uses 3/16 gallon of water to water every 1/3 square foot of his garden.How many gallons of water does Mr. Kirkson use per square foot to water his garden each week?

fraction in simplest form.

Answers

He uses 3/16 gal for 1/3 square foot.

1/3 square foot is 1/3 of 1 square foot.

1 square foot is 3 times as much area as 1/3 square foot, so he must use 3 times as much water. We need to multiply 3 * 3/16.

3 * 3/16 = 3/1 * 3/16 = 9/16

Answer: He uses 9/16 gallon.
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