What is the answer to solve -2=4r+s for s

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

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in

Agroup of three friends order a combo meal which includes two slices of pizza and a drink each drink is priced at $2.50 the combined total of $31.50 how much is the cost of a slice of pizza