Answer:
2
Step-by-step explanation:
The value of the discriminant is the value of

located inside the square root of the quadratic formula. To find this, we simply look at the quadratic equation in standard form:

and plug in the existing values into the quadratic formula (

. Plug in the values of a b and c (2, 7, and -4, respectively) and get

.
Simplifying this, we get

which equal 1/2 and -4, respectively.
A )The value of the discriminant is 81 (see work above)
B ) 2 solutions, discriminant is positive, and not equal to zero. They are both rational since sqrt 81 is a rational number
C ) 1/2 and -4 (see work above)
Answer:
C(x)=40x+14, 6 days
Step-by-step explanation:
C(x)= payment per day*x + initial payment. the payment per day is $40 while the initial payment is $14. so C(x)=40x+14.
C(x)=254=40x+14, 40x=240, x=6
Confidence interval = p+/- standard error
Where;
p = percentage of he population using internet = 57% = 0.57
Standard error = Z*Sqrt [p(1-p)/N)]; where N = sample size = 1025, Z at 99% confidence = 2.58
Substituting;
Standard error = 2.58*Sqrt [0.57(1-0.57)/1025] ≈ 0.04
Then,
Confidence interval for the true population using the internet = 0.57 +/- 0.04 = [(0.57-0.04),(0.57+0.04)] = [0.53,0.61] = [53%, 61%].
Slope of 0 would be the answer