Answer:
yes your class mate is correct ..........
The answer is in the picture below I used the square rooting method hope this is the answer you need!
There’s no work for you to show
Simplify the function
in the following way:

If you have to translate the graph of the function 3 units lower (down), then

The graph of obtained function opens in the same direction as the graph of the function 
Answer: 
4.8 x 10^-2
You can do this without a calculator
Explanation:
(3.2 x 10^-5) x (1.5 x 10^3)
First, you multiply 3.2 by 1.5 to get 4.8
Next, you add the exponents together: -5 + 3 = -2
Now, put everything into one answer (the 10 stays the same): 4.8 x 10^-2