So the second question asks about the perimeter of a rectangular pool and the answer for that is W=87m.
I don’t know about the first question sorry but I’ll try figuring it out.
A. 10g4h9
-5gh4(-2g3h5)
(-5 x -2)= 10
(g x g3)=g4
(h4 x h5)= h9
= 10g4h9
Ask some people if they got buses and tell them y
Answer: 
Explanation:
Highlight the first digit on the very left (2). The 7 right next to it means we'll round that 2 up to a 3. Every other digit becomes a zero.
The number 27,895,168,401,112 rounds to 30,000,000,000,000 which is the number 30 trillion.
It converts to the scientific notation
because we basically start with 3.0 and move the decimal point 13 spots to the right to arrive at 30 trillion as shown above.