Find x and y if angle one is 2x+10 and angle two is 4y-30

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

What is x3+3x2−16x−48 divided by x−1?