Y=3/4x+2 linear or non linear

One positive number is 9 more than twice another. if their product is 95, find the numbers

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)?

Which value would be a solution for x in the inequality 47-4x< 7