Determine which situation can be modeled by the graph below. A.
Mark is following a recipe where the number of cups of flour, x, and three-fourths the number of cups of sugar, y, is at most 15 cups.
B.
A bookstore inventory is split such that three-fourths the number of aisles of fiction, x, and the number of aisles of nonfiction, y, is at least 15 aisles.
C.
Jenny makes $6 each time she walks her neighbor's dog, x, and $8 for each hour she babysits, y. She has earned no more than $120 total.
D.
Mixing four parts blue paint, x, and three parts red paint, y, creates a batch of less than 60 units of purple paint.

The weibull distribution is widely used in statistical problems relating to aging of solid insulating materials subjected to aging and stress. use this distribution as a model for time (in hours) to failure of solid insulating specimens subjected to ac voltage. the values of the parameters depend on the voltage and temperature; suppose α = 2.5 and β = 190. (a) what is the probability that a specimen's lifetime is at most 250? less than 250? more than 300? (round your answers to four decimal places.) at most 250 less than 250 more than 300 (b) what is the probability that a specimen's lifetime is between 100 and 250? (round your answer to four decimal places.) (c) what value is such that exactly 50% of all specimens have lifetimes exceeding that value? (round your answer to three decimal places.) hr