Suppose sin(x) = -3/5 and cos(x) < 0. what is the value of cos (2x)?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.