Answer this ASAP it’s due like 20 minutes pls answer ASAP!!

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Triangle xyz has vertices x(1,3), y(0,0)

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.