Answer:
Option C. 
Step-by-step explanation:
we know that
Using a Excel tool (Correl function)
see the attached table
The r-value is 
X² - 4x - 77 = 0
( x + 7) ( x - 11)
x + 7 = 0
x - 11 = 0
x = -7
x = 11
Answer:
x=13
Step-by-step explanation:
15x-15
15*13=195
195-15=180
(a)7x4=28
2x2=4
28-4=24
24-1=23 points
(b)20/4=7 correct answers