PLZ HELP ASAP! I GIVE BRAINLIEST AND POINTS! please dont post links

Find the value of the monomial.
5x^3 for x = 0.5

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

The weight of a full steel bead tire is approximately 800 grams, while a fighter wheel weighs only 700 grams. what is the weight of each tire in pounds?