AB CALC PLEASE HELP1

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

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

3questions show how you solved the problem 1. subtract & simplify (–y2 – 4y – 8) – (–4y2 – 6y + 3) 2.multiply and simplify 2x2y3z2 · 4xy4x2 3.multiply and simplify (x – 4) (x2 – 5x – 6)