( Please and thankyou) Which expression is equivalent to (2x^2 + 6x -3) + (x^2 - 2x -7)

Which best explains why this triangle is or is not a right triangle ?

Write the percent as a fraction or mixed number in simplest form. 0.8%

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