If 9 oz make 10 servings how many oz do i need to make 13 servings

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !