Calculate the area of triangle abc with altitude cd, given a(−7, −1), b(−1, 5), c(0, 0), and d(−3, 3).
a.9 square units
b.18 square units
c.18.5 square units
d. 21 square units

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?