Please help me out! I don't know what i'm doing!!

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

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

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar