If you buy 5 donuts for $3 how much would it cost for 1 donut show answer as a decimal

What is x and y intercepts for y=x+7

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

Solve the system of equations. y=3x-1 and y=-2x+9. show work