First one is c and second one is 6.2 x 10^1
I feel like it would be 5/12, but im not 100% sure

you would need to make 0.03 a whole number 1st, so you take the decimal point and move it 2 places, and you do that to 8.4.

Now, divide the way you would usually do. If there is a remainder, keep adding 0's until you get the answer with no remainder. If the 0 keeps going on and on just stop after 2 0's.
Formula
Area = L*w
Hint : To find the area of a rectangle , multiply the length times the width
I hope that's help !