Why might this group of toys not be a valid sample? Check all that apply.

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction