PLEASE HELP Ivy purchases 8 books at the used book store. Paperback books cost $4 each, and hardback books cost $8 each. If x
represents the number of paperbacks purchased, which three statements are true when determining the number of
each type of book purchased?
A)
4x represents the total cost of the paperbacks purchased.
B)
8(8 + x) represents the total cost of the hardbacks purchased.
C)
4x + 8(8 - x) = 44 can be used to solve the problem.
D)
Ivy spent $25 dollars on paperbacks.
E)
Ivy bought 3 hardback books.

Aprisoner is trapped in a cell containing three doors. the first door leads to a tunnel that returns him to his cell after two days of travel. the second leads to a tunnel that returns him to his cell after three days of travel. the third door leads immediately to freedom. (a) assuming that the prisoner will always select doors 1, 2 and 3 with probabili- ties 0.5,0.3,0.2 (respectively), what is the expected number of days until he reaches freedom? (b) assuming that the prisoner is always equally likely to choose among those doors that he has not used, what is the expected number of days until he reaches freedom? (in this version, if the prisoner initially tries door 1, for example, then when he returns to the cell, he will now select only from doors 2 and 3.) (c) for parts (a) and (b), find the variance of the number of days until the prisoner reaches freedom. hint for part (b): define ni to be the number of additional days the prisoner spends after initially choosing door i and returning to his cell.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

Vinny is interviewing for a job. he wants his take home pay to be at least $42,000.what is the least salary he can earn if he pays 25% income tax?