Will the sum of 8 + (-9) br positive or negative?

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

Prove that quadrilateral is a rhombus.

Factor the polynomial by its greatest common monomial factor.