You take the length of the side and divide it by 2.
+50%
as 2/2 is 1 which means that 1 is half of 2. Half can also be written as 50%
The answer would be 18
firstly: 15/5 =3
= 3=1/5
= 3= 3/5
= 3×3
= 9 + 9= 18
The distance in scientific notation is 5.6x10^5 miles. ^ is to the power of. Start from the right of a number and count the number of spaces till you get between the first two numbers, and that is how you get your exponent. It would be a different case if you had a decimal number though. For example the scientific notation of 0.00000256 would be 2.5x10^-6. You would count the number of spaces from the left to right and the exponent would be a negative.