How to determine arcs and angles in a circle?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Jane is cooking beans and rice for dinner tonight. she has 4 cans of black beans, 6 cans of red beans, and 3 cans of garbanzo beans in her cupboard. if she grabs a can of beans without looking at the label, what is the probability of her making black beans and rice for dinner?

Write the expression 7x^3-28xy^2 as the product of 3 factors