A charm bracelet costs $65, plus $25 for each charm. The equation -25x+y=65 represents the cost y (in dollars) of the bracelet,
where x is the number of charms.
a. Graph the equation.
b. How much does a bracelet with three charms cost?
a. Graph the equation.
b. How much does a bracelet with three charms cost?
1 answer:
Answer:
a. see attached
b. $140
Step-by-step explanation:
<h3>a.</h3>The graph starts at y=65 when x=0 and increases by 25 for each increase of 1 in x. The attachment shows a graph of the equation.
__
<h3>b.</h3>Use x=3 in the equation.
-25x +y = 65
y = 65 +25x = 65 +25(3) = 140
A bracelet with 3 charms costs $140.
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Answer:
Confidence interval
And the margin of error would be:
Step-by-step explanation:
For this case we have the followig dataset:
DATA: 8.2; 9.1; 7.7; 8.6; 6.9; 11.2; 10.1; 9.9; 8.9; 9.2; 7.5; 10.5
We can calculate the mean and the deviation with the following formulas:
And replacing we got:
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom are given by:
The Confidence level is 0.95 or 95%, the value of significance is and
, and the critical value would be
Repplacing the info we got:
And the margin of error would be: