How do I Simplify
-72 divide by 3

Which expressions are equivalent to -6 + 3m

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.