You use the lower case letter s for the sample standard deviation
You use the greek letter sigma (written as
) for the population standard deviation
Answer:
4x^2+17x+15
Step-by-step explanation:
(4x-3)(x+5)
= 4x(x+5) -3(x+5)
= 4x^2+ 20x -3x + 15
= 4x^2 + 17x + 15
You need 270 cookies for 90 students.
It would be the mean I’m pretty sure