3/13, 4/13, 5/13 does this add up to a right triangle? and why or why not?

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189

Which equation represents h for right triangle abc

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2