Expand the exppresion -7(k-3)

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

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).