The daily revenue at a university snack bar has been recorded for the past five years. Records indicate that the mean daily revenue is $2500 and the standard deviation is $300. Suppose that 100 days are randomly selected. What is the probability that the average daily revenue of the sample is lower than $2580

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

correct answer:

i^31 = -i

i need more info. are you looked to see there mph? how much they deliver? how far they go?

step-by-step explanation:

apex answer is: true.