Me with this problem i don't understand how to solve it 1.) simplify. √18

Combine like terms to make a simpler expression 3z+z

Mario is constructing a frame for 10 in. by 8 in. photo. he wants the frame to be the same with all the way around in the same area of the frame and photo to be 120 square inches what is the dimension of the frame?

Which strategy is used by public health to reduce the incidence of food poisoning?