1400 dollars is placed in an account with an annual interest rate of 7.75%.To the nearest tenth of a year, how long will it take for the account value to reach 6400 dollars?

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

d. corresponding side lengths in similar triangles are proportional in length.

step-by-step explanation:

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