Write a recursive formula for the following explicit formula and find the first term an=-29+14n

Plz which expression is equivalent to the expression below?

Question: what is the value of x 4x-2= (-7) +5x. it would be greatly appreciated if someone could actually explain to me step by step

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b