Answer:
A. 
Step-by-step explanation:
Step 1: We know .3333... is
, we rewrite the equation as 

Therefore the answer would be A. 
23(3) + 3
= 72
Why do you write 2 equations?
10 + -70
Step-by-step explanation:
The side length 51 is the hypotenuse.
24*24+45*45=2601
The square root of 2601 is 51.
Please note that the hypotenuse is most likely the longest side.
Remember that scientific notation always contains a number between 0 and 10 that is multiplied by ten to some power. In this case, to get a number between 0 and 10 (7.2) we would move the decimal point once to the right. Since it is moving to ththe right, the exponent over the 10 will be negative, and it will be -1 because we moved the point once. So the answer is 7.2*10^-1
Hope this helps