Ming took a cab across town. his fare was 22$ and he leaves an 18 percent tip.

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

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

Ineed ! what is the connection between ratios, fractions, and percents? give an example with your answer.