Help please, if you answer can u explain it

Guests at an amusement park must be at least 54 inches tall to be able to ride the roller coaster. which graph represents the set of heights that satisfy this requirement?

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?