PLEASE HELP I NEED THIS NOW, AND IS POSSIBLE A EXPLICATION

Part a : solve -vp + 40 < 65 for v part b : solve 7w - 3r = 15 for r show your work .

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

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)?