exam Maths Puzzle Numerical Ability

-5 - 2(3x - 4) = 21

how do i solve for x??

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exam Other Question

Algebraically determine the zeros of each of the following exponential functions:
a)f(x)=(4(^-4x)) -sqrt64
b)f(x)=(sqrt3*5(^-(2x-4))-sqrt75
c)f(x)=(4(1/2)^2x)-64 Dr. Sand borrowed some money to buy new furniture for her office. She paid $245.00 simple interest on a 3.5-year loan at 3.5%. Find the principal.

I got $2,400 but I was told that is not correct. What have I done wrong?