Select all the expressions that correctly calculate the perimeter of the shape. Group of answer choices

40+20π

80+20π

120+20π

300+100π

10+10+10π+10+10+10π

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?