What is the correct side values 45-45-90 triangle

On a piece of paper graph f(x)=5•(0.4)^x

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

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)