2x+3y=9xy is this a linear or non-linear function pls give steps if posible

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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)?

What term makes it inconsistent y=2x - 4