Answer:
If we used the quadratic formula to solve the equation we can say:
-b = -5
b² - 4ac = 13
2a = 2
Solving the first and last equations we get b = 5 and a = 1. Substituting these values into the second equation we get:
25 - 4c = 13
Solving this we get c = 3 so the answer is x² + 5x + 3.
Answer: C
Step-by-step explanation: x represents the number of classes, not the cost of classes.
Answer: 31
Step-by-step explanation: 11+20=31
390
Step-by-step explanation:
.