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lions [1.4K]
4 years ago
6

I need help with this question

Mathematics
1 answer:
WITCHER [35]4 years ago
5 0
I believe it is D
if not it is A
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What happens if simultaneous Equations have two of the same variable like below? How would I solve it?
hoa [83]

Answer:

C = 20

Step-by-step explanation:

What happens if simultaneous Equations have two of the same variable like below? How would I solve it?

6A + 4B + 5C = 390

6A + 4B + 5.75C = 405​

Step 1

We solve for C first

6A + 4B + 5C = 390....Equation 1

6A + 4B + 5.75C = 405​... Equation 2

We substract Equation 1 from Equation 2

0.75C = 15

C = 15/0.75

C = 20

4 0
3 years ago
The cylinder below has a volume of 2,512 cubic cm and a height of 8 centimeters. What is the diameter of the cylinder? Use 3.14
EastWind [94]
Calculate the volume of a cylinder using the formula V = r2 × π × h. Begin by first finding the area of the circle at one end. Square the radius of the circle and multiply the result by "pi" (the symbol π), or approximately 3.14. Multiply this result by the cylinder's height to get its volume.
4 0
4 years ago
Read 2 more answers
4x - 20 = -2 ( -3x + 22 ) plz help will pick brainlist
ololo11 [35]

Answer:

x=12

Step-by-step explanation:

4x - 20 = -2 ( -3x + 22 )

4x-20=6x-44

24=2x

x=12

8 0
3 years ago
Rachel has $80 in a savings account.The interest rate is 10%per year and is not compounded. How much interest will she earn in 1
erma4kov [3.2K]

Answer:

I = $ 8.00

Equation:

I = Prt

Step-by-step explanation:

First, converting R percent to r a decimal

r = R/100 = 10%/100 = 0.1 per year,

then, solving our equation

I = 80 × 0.1 × 1 = 8

I = $ 8.00

The simple interest accumulated

on a principal of $ 80.00

at a rate of 10% per year

for 1 years is $ 8.00.

5 0
3 years ago
Solve using substitution-2x-y=-9. 5x-2y=18
Sunny_sXe [5.5K]
Equation 1)  -2x-y=-9
Equation 2)  5x-2y=18

Multiply all of equation 1 by 2, so that both equations have (2y) in them.

1)  2(-2x-y=-9)

Simplify.

1)  -4x-2y=-18
2)  5x-2y=18

Subtract equations with each other.

-9x=-36

Divide both sides by -9.

x=4

Plug in 4 for (x) into equation 1.

-2x-y=-9

-2(4)-y=-9

Simplify.

-8-y=-9

Add 8 to both sides.

-y=-1

Divide both sides by -1.

y=1

(4, 1)

~Hope I helped!~

5 0
3 years ago
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