Hey don’t worry about that grade just keep practicing maths and honestly at one point you’ll start understanding the concepts trust me. Just do it a lot.
So here are my explanations
Answer:
C
Step-by-step explanation:
Use a quadratic equation regression calculator.
Plugging in all the points, the equation should come somewhere close to

Which is answer choice C.
Answer:
b = 11
Step-by-step explanation:
the standard form of a quadratic equation is ax² + bx + c = 0 ( a ≠ 0 )
given
x² + 28 = - 11x ( add 11x to both sides )
x² + 11x + 28 = 0 ← in standard form
with b = 11
Answer:
6 5/10
Step-by-step explanation: