2. The table shows the amount spent on tomatoes at three different stands
at a farmer's market. Which stand sold their
tomatoes at the least
expensive price per
pound, and what is that price? Round to the
nearest cent, if necessary. (Lesson 1)
Stand
Weight (lb)
Cost ($)
A
3
4
2.00
B
mit - ab
3.45
с
14.85

Use the Law of Cosines, since you have 2 side lengths and the measure of the included angle.

The third side could be named "a."  Then, according to the Law of Cosines,

a^2 = b^2 + c^2 - 2(a)(b) cos C, where C is the included angle, and a=b in this particular problem.  Thus,

a^2 = 2b^2 - 2ab cos C.