Plz help its easy for people that arn't me

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax

In terms of x, find an expression that represents the area of the shaded region. the outer square has side lengths of (x+5) and the inner square has side lengths of (x-2), as shown. area: a1 x + a2 square units submit