Which of the following equations has a maximum at (9,7)? A. y = -x2 + 14x − 40 B. y = -x2 + 18x − 74 C. y = -x2 − 14x − 58 D. y = -x2 − 18x − 88 WILL MARK BRAINLIEST

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

If a revenue in total for a month was $9,950, fixed expenses were $9,000, and variable expenses were $300 what would be the total profit/ loss for the month?