Given cot A= -7/3 and that angle A is in Quadrant II, find the exact value of cos A in simplest radical form using a rational denominator.

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5