Simplify: (-10)^4 a.-6 b.-40 c.10,000 d.-10,000

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

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)?

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.