I need help with online schooling

Step-by-step explanation:

Right angles always add up to 90°. You can tell it's a right-angle because of that square in the corner.

Anyway, the two angles should add up to 90°. So set up your equation:

70° + 3x = 90°

3x = 90 - 70

3x = 20

x = 20/3

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

ok thats very interesting