What could be shown about the diagonals of parallelogram PQRS to complete the proof that diagonals of a parallelogram bisect each other? PR and SQ have the same length.
PR and SQ have the same midpoint
Angles formed by the intersection of PR and SQ each measure 90°
PR is a perpendicular bisector of SQ

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

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.