1. three hundred forty-five thousand
2. 300,000 + 40,000 + 5,000
(16x^2+4x-4x-1)-3=15x^2
16x^2-1-3=15x^2
16x^2-4=15x^2
X^2=4
X=+or-2
6/16 which is .375, round that to the nearest hundredth and you get .38
The answer is 7173
8531-1358

Now, If the exponent was negative like you asked....