Using the quadratic equation we get:

Factoring out 2 we get

Factoring out the imaginary number:

So b.
Is that area if so the answer is 12
7b is just 7 x b and if b is 6 its just 7 x 6
which the answer is 42
9 years because if you do 4700 * 1.03= 4831 now do that 9 times you get 6,132.43