Explain the answer for this question, you!

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

What function has a range {yly< 5}? question on picture above^