Kevin gets on an elevator in a skyscraper. The elevator starts to move at a rate of -15ft/s. After 4 seconds on the elevator, Kevin is 260 ft from the ground floor of the building. What is the rate of change?
a - (-260 ft/s )
b - (15 ft/s)
c - ( - 15ft/s)
d - (260/4 ft/s)

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.

What is 74 round to the nearest ten