How many tiles each 30cm by 30cm will be needed for floor

Solve the system of equations. y= 2x y= x^2 - 15

What is the value of x in the this question ?

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