On Monday, the price of gas was $3.50; on Tuesday the price dropped by $0.50; and on Wednesday, the price increased by $0.65. Write and solve an addition
equation to show the final price of gas.

Which expression gives the area of the triangle shown below

Can any one me with the answers to these questions asap?

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