If the quotient of 7/8 and 1/7 is subtracted from the product of 2 3/4 and 2 2/7 what is the difference

Is the figure congruent? yes or no?

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?

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c