Anyone help pls because this is confusing

Asquare parking lot has 6,400 square meters what is the length in meters

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

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