Someone me i suck @ simplifying you

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?