Help pls.​

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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