HELP?

Which of the following expressions is equal to 2x^2+8

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p. mc) knowing that it is going to rain tomorrow, and going to bed before 9 p. md) knowing that you have a test in school tomorrow, and studying thw night before