Calvin works at a clothing store. He
sells 3 pair of jeans for $66.49
each, 2 shirts $28.99 each, and a
belt for $15.40. He also gives a
refund for a coat that a customer
returned for $89.95. What is the
net change in the amount of money
for the store?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?