Fifty decreased by 8 times a number

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply

Which of the following vectors are orthogonal to (2,1)? check all that apply

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?