LOTS OF POINTS AND WILL BRAINLIEST!?!?!?! I need help with 10 and 12 i already did 9 and 11

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

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

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale