Complete the proofs that angle RUV is congruent to angle QRU

Find the height of a square pyramid that has the volume of 32 ft.³ and a base lengthof 4 feet

Need solving this second acceleration problem.

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).