Solve the system of equations for X

4x-2y=4
4x-y=5

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?

∠a and ∠ b are complementary. if m∠ b = 80°, what is the measure of ∠ a? 10° 80° 90° 100°