2=4(-3) + b
2= -12 + b
14= b
Y=4x + 14
-6 7/8 /(-3 3/4)
55/8X4/15
11/6
1 5/6
By "density" I assume you mean "probability density function". For this to be the case for

, we require

Since

you have

which means
When a quadratic equation ax^2+bx+c has a double root, the discriminant,
D=b^2-4ac=0
Here
a=2,
b=b,
c=18
and
D=b^2-4ac=b^2-4*2*18=0
solve for b
b^2-144=0
=> b= ± sqrt(144)= ± 12
So in order that the given equation has double roots, the possible values of b are ± 12.
The answer is the test contains 10 3pt questions and 14 5 pt questions. Any questions please just ask!!! thank you!