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find an irrational number between square root of 7 and square root of 11

An Italian Ice (snowcone) retailer is examining his profits for the spring season of the previous year. He realizes that his sales are based on the daily weather: sunny, average, or cold. He estimates that this year the probability of it being sunny is 0.2, average 0.5, and cold 0.3. His gross sales on these three types of days average $50, $35, and $10 respectively.

a. Find the expected income in any one day.

b. If the average supplies cost $18, what is the expected daily profit?

F(x)={-1, if x<0. Limit

0 , if x=0. x--->0 f(x)

1 , if x>0

f(x) =1/(1 + cos x)

Find the maximum and minimum values of the curve and distinguish them y=x^3-6x^2+9x+6