Could some give the answers AND a good explanation

1.It is B This is because if you put that expression in scientific notation that’s what you will get.

2.It is A This is because you need to take the translation and multiply them equally to get this scientific notation.

Step-by-step explanation:

hope this helped!

add them all together then divide among them.

Add 83 + 92 + 47 + 78 + 80 = 380

then divide by the amount of test which is 5 because we have 5 test scores

divide 380 ÷ 5 = 76

The average percentage for all is 76%

Hope this helps :)

Step-by-step explanation: