What is the zero of the function below? f(x) = 3x - 15
2 answers:
Answer:
x = 5
Step-by-step explanation:
A zero is another word for an x-intercept, which is where the function crosses the x-axis on a graph. One way to find the x-intercept is by graphing the equation. I did so, and I found that the x-intercept of this function is x=5. I'll attach a photo of the function below.
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Answer:
We need a sample size of least 119
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
95% confidence level
So , z is the value of Z that has a pvalue of
, so
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At least n, in which n is found when
We don't know the proportion, so we use , which is when we would need the largest sample size.
Rounding up
We need a sample size of least 119
Answer:
see explanation
Step-by-step explanation:
ΔABE and ΔACD are similar hence the ratios of corresponding sides are equal, that is
=
=
Using the first pair of ratios then
= 4 =
, hence
4ED = 26 ( divide both sides by 4 )
ED = 6.5 cm
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(b)
Similarly
= 4, hence
BE = 4 × 18 = 72 cm