Ben bought an item in a grocery store marked at $8, and the total bill with sales tax was $8.28. What was the sales tax rate?
O 35%
O 7%
O 3.5%
O 2.8%

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)?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

What is the solution set of the quadratic inequality x^2-5< or equal to 0