How to enlarge or reduce triangle by radial method.​

Keisha makes a large sandwich for a family picnic she takes 1/2 of them the sandwich to the picnic her family eats 3/8 of the whole sandwich what fraction of the whole sandwich does keisha bring back from the picnic

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d.y +14z