Find the total balance of each investment account earning simple annual interest. a: $624 at 5% for 3 years
b: $4,120 at 7% for 18 months
c: $900 at 3.1% for 6 months
d: $275 at 4.8% for 8 years

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Step-by-step explanation:

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step-by-step explanation:

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.