Subtract and simplify 20 2/7 - 26/35

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

What is the value of x? enter your answer in the box. x =