Rachel buys a bag of apples for $3.21. She pays for the bag with a $20 bill. How much change should Rachel receive?

Don't know how to find x given these segment lengths

Askyscraper is 396 meters tall. at a certain time of day, it casts a shadow that is 332 meters long.at what angle is the sun above the horizon at that time?

Evaluate the expression for the given value of the variable. ∣-4b-8∣+∣-1-b^2 ∣+2b^3 ; b=-2