Which of the following is the same as 2.3 x 10³

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Determine the domain and range of the given function. the domain is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}. the range is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}.

What is the simplified form of square root of 400 to the 100th power ?