Help me please I really need help

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

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

What is the domain of the step function f(x)=[2x]-1?