Evaluate 3r(t+4) if r=2 and t=7

Need on this geometry question. explain how you did it.

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Astrid spent $36 on new shoes. this was $12 less than twice what she spent on a new skirt. part a: which equation would solve for how much she spent on the skirt? part b: solve the equation in the workspace provided below. how much did astrid spend on her skirt?