Can you guys please help me with number 4? this is due tomorrow and i’m panicking :(

Find the solution of each of the following.

What are the solutions of the following system? y=-2x^2 y=x-2

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9