If a number is sub tracted from its square the result is 2. Find the number. ​

Do u just plot the numbers on the graph like (1,

Y=4x^2+x-1 solve using quadratic formula

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)?