PLEASE HELP MEE AND HURRY ALSO SHOW WORK

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1