OpenUp 8th Math 4.9 Review

Cell phone Plan A costs $70 per month and comes with a free $500 phone. Cell phone Plan B costs $50 per month but does not come with a phone. If you buy the $500 phone and choose Plan B, how many months is it until your cost is the same as Plan A's? Type the number only

Priya and Han are biking in the same direction on the same path.

Han is riding at a constant speed of 16 miles per hour. Priya started riding a half hour before Han. If Han has been riding for t hours, how long has Priya been riding?

Priya and Han are biking in the same direction on the same path.

Han is riding at a constant speed of 16 miles per hour. Priya started riding a half hour before Han. Priya is riding at a constant speed of 12 miles per hour. Select an expression that shows how many miles Priya has gone after Han has been riding for t hours.

Priya and Han are biking in the same direction on the same path.

Han is riding at a constant speed of 16 miles per hour. Priya started riding a half hour before Han. Priya is riding at a constant speed of 12 miles per hour. When will Priya and Han meet?

• At 5 p.m., the temperatures recorded at two weather stations in Antarctica are -6 degrees and 2 degrees. The temperature changes at the same constant rate, x degrees per hour, throughout the night at both locations. The temperature at the first station 3 hours after this recording is the same as the temperature at the second station 4 hours after this recording.

• Elena and Kiran play a card game. Every time they collect a pair of matching cards, they earn x points. At one point in the game, Kiran has -6 points and Elena has 2 points. After Elena collects 3 pairs and Kiran collects 4 pairs, they have the same number of points.