MATHEMATICS MIDDLE SCHOOL

Solve the system of equations by the addition method.
x- y=-9
x+y=-5

Answers

Answer 1
Answer:

Answer:

x=-7, y=2. (-7, 2).

Step-by-step explanation:

x-y=-9

x+y=-5

-----------

2x=-14

x=-14/2

x=-7

-7-y=-9

y=-7-(-9)

y=-7+9

y=2

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23 7/5
simplest form

Answers

23 7/5 = 23 + 7/5

7/5 can also be written as 1 2/5

And so then:

23 + 1 2/5

= 24 2/5

And that is your answer (:

A triangle has sides of length 12 miles, 9.6 miles, and 7.2 miles. What is the perimeter?

Answers

12+ 9.6+ 7.2=28.8 miles is the perimeter
                                28.8
You would have to add up all the sides! So, you would do 12 + 9.6 + 7.2
This equals to 28.8 miles! That's the perimeter! Good luck! :]

What is a irrational number by a circumference

Answers

A real number is rational, if it is the ratio of two integers. Otherwise it is called irrational. If D is the diameter of circle, then C = π D is it's circumference.

use benchmarks to determine the customary and metric units you would use to measure the height of your house

Answers

Conventional US measurement would be feet and inches high. And Metric measurements would be meters.

Find the area of a circle with a diameter of 22 inches. Use 3.14 for pi

Answers

The formula for the area of a circle is A = π r^2


r is the radius, which is half of the diameter.


The diameter is given as 22 inches, the radius would be 2 /2 = 11 inches.


Area = 3.14 * 11^2

Area = 3.14 * 121

Area = 379.94 square inches.

To do this, use this formula=The area is always pie times the radius to the 2nd(\pi r^{2} ). The radius is half the diameter(22/2) which is 11. Now we need to bring this to the power of 2 (11x11), which is 121. Now we multiply by pie (3.14x121) which is 379.94. Your answer is

379.94 inches!!!!

3 over 4 n minus 18 equals 1 over 4 n minus 4

Solve

Answers

n=28. Step 1: Subtract 1/4n from both sides.34n−18−14n=14n−4−14n12n−18=−4Step 2: Add 18 to both sides.12n−18+18=−4+1812n=14Step 3: Multiply both sides by 2.2*(12n)=(2)*(14)
3/4n - 18 = 1/4n - 4
3/4n = 1/4n - 4 + 18
3/4n - 1/4n = -4 + 18
2/4n = 14
1/2n = 14
n = 14 × 2
n = 28
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