Is ((1),(2),(3)) and (1,2,3) equal, both, or neither

For each proportion find the unknown number x 1/5/8=×/15

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9