Say that you're thinking of number
You multiply it by 8, and have
You add -1 (i.e., you subtract 1) and have
This equals -17, so you have
Add 1 to both sides
Divide both sides by 8:
So, you were thinking of -2.
HELP!! What are the intervals for the increasing and decreasing of this graph??
2 answers:
See the attached two images to visually see where the function is increasing and decreasing. (There's one image for each.)
We identify where a function is increasing based on where the y-values increase as the x-values increase. In other words, as you move left-to-right, the function is increasing if the function is moving upwards.
We identify where a function is decreasing based on where the y-values decrease as the x-values increase. In other words, as you move left-to-right, the function is decreasing if the function is moving downwards.
In both cases, while you recognize where it's one or the other based on the y-values, you describe it based on where it's happening, based on the x-values. The y-values tell you what's happening, the x-values tell you where it's happening.
The function is increasing on the intervals (-infinity, -4) and (-2,infinity). This is the red highlighted portions.
The function is decreasing on the interval (-4,–2). This the the blue highlighted portions.
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Answer:
52.74% probability that a randomly selected airfare between these two cities will be between $325 and $425
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean and standard deviation
, the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question, we have that:
What is the probability that a randomly selected airfare between these two cities will be between $325 and $425?
This is the pvalue of Z when X = 425 subtracted by the pvalue of Z when X = 325. So
X = 425
has a pvalue of 0.7088
X = 325
has a pvalue of 0.1814
0.7088 - 0.1814 = 0.5274
52.74% probability that a randomly selected airfare between these two cities will be between $325 and $425