Iwas able to find one answer but not the other one. could someone ?

thx

Someone answer this check out the image!

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

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