Please help ASAP (: -7 = v + 3
(Please solve for v I am very bad at math and could you maybe leave an explanation if you could? My online teachers don't make any sense to me)

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

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?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.