Choose the correct simplification of (3x3 + 2x2 − 5x) − (8x3 − 2x2)

a.−5x3 + 4x2 − 5x
b. 5x3 + 2x2 + 5x
c.−5x3 − 4x2
d. 5x3 + 2x2

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a