Darnell and Stephanie have competing refreshment stand businesses. Darnell's profit can be modeled with the polynomial 7c2 + 120 -250, where is the number of items sold. Stephanie's profit can be modeled with the polynomial 4c2 - 9c - 178. Show your work.

a. Write a polynomial that represents the difference between Darnell's profit and Stephanie's profit.

b. Write a polynomial to show how much they can expect to earn if they decided to combine their businesses.

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

the first option i believe

step-by-step explanation:

n=1.75+1.75

step-by-step explanation:

3.5/2=1.75

y=-2x0 is most likey your asnwer