Want to ask how to do it . n some concepts i don't understand for example

The two-way table shows the number of people whose hobbies are reading or solving puzzles and who either ride a motorcycle or don’t ride a motorcycle. among people whose hobby is reading, what is the relative frequency of not riding a motorcycle? express your answer as a decimal, and round it to the nearest hundredth if necessary. enter your answer in the box. reading solving puzzles ride a motorcycle 7 3 don't ride a motorcycle 5 9

For the equations below which statement is true ? -2x=14 6x=-42

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.