Where does the graph of
y = x^2 - x - 20 cross the x-axis?

(-5,0) and (4,0)
(4,0) and (5,0)
(2,0) and (-10,0)
(5,0) and (-4,0)

D

Step-by-step explanation:

"Cross the x-axis" means that y =0

0=x²-x-20

(x-5)(x+4)=0

x=5, x= - 4

Points (5,0) and (-4,0)

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;