Answer:
A.)
or -1.43136... (Decimal Form)
B.) 
Explanation: I inserted image to explain how to solve the second one, but for the first one you can't go any further except writing it in standard form or changing it into a decimal.
Your welcome :3
Price in the sale=£31-10% of £31
price in the sale=£31-(10/100)*£31=£31-(10*£31)/100=£31-£3.1=£27.9
The price in the sale is £27.9
X=270 units
270 units can be manufactured per month
Answer:
the correct answer is 2(45+484y)