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murzikaleks [220]
3 years ago
8

If f (x) = 3x²-7 , find f(4)

Mathematics
2 answers:
vitfil [10]3 years ago
6 0
Hello, 
To solve this function for f(4) we need to plug 4 into f(x) and the result will be our answer. We know that f(x) is 3x^2-7. Plugging in 4 we get 3(4)^2-7=41. Therefore, f(4)=41. Hope this helps!
Alla [95]3 years ago
4 0
What the question is asking you to do is plug in 4 in place of x in the given equation: 
f (x) = 3(4)^2-7 

4^2=16*3-17=41
Final answer: 41
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Adding similar terms from the left side of the equation:

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Complete question :

Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time (USA Today, April 4, 2012). In February of 2012, a sample of 1000 adults showed 410 indicating that their financial security was more than fair. In February of 2010, a sample of 900 adults showed 315 indicating that their financial security was more than fair. a. State the hypotheses that can be used to test for a significant difference between the population proportions for the two years. H : Pi - P2 - Select your answer HA : P1 P2 - Select your answer - b. What is the sample proportion indicating that their financial security was more than fair in 2012? Round your answer to two decimal places. In 2010?

Answer:

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The null and alternative hypothesis :

H0 : p1 - p2 = 0

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The null means there is no difference in proportion for the two years while the alternative claims that there is difference in proportion for the two years.

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Phat = 315 / 900

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