10 times 10 exponent form word form

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Which expression equals 9^3 sqrt 10 a. 5 sqrt 10 + 4 sqrt 10 b. 5^3 sqrt 10 + 4 ^3 sqrt 10 c. 5 sqrt 10 + 4^3 sqrt 10 d. 5^3 sqrt 10 + 4 sqrt 10

Betty correctly answers 30 questions on your math test there are 40 questions on the test what percent of the questions did she answered incorrectly