Answer this question! 30 points and brainliest!

-2x^2 +18x+2

Step-by-step explanation:

-x^2 +9x+1 +-x^2 +9x+1

I like to line them up vertically

-x^2 +9x+1

-x^2 +9x+1

-2x^2 +18x+2

a

Step-by-step explanation:

To simplify remove parenthesis and collect like terms

(- x² + 9x + 1) + (-x² + 9x + 1)

= - x² + 9x + 1 - x² + 9x + 1 ← collect like terms

= (- x² - x² ) + (9x + 9x) + (1 + 1)

= - 2x² + 18x + 2 → a

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;

answer: 1+1

step-by-step explanation: 1+1 is at least 2