How many of each angles are in a pentagon

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

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?

Consider an example of a deck of 52 cards: example set of 52 playing cards: 13 of each suit clubs, diamonds, hearts, and spades ace 2 3 4 5 6 7 8 9 10 jack queen king clubs diamonds hearts spades what is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.