Idon't understand converting exponential to radical form. (54y)^2/3

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤