Answer: c. z = 1.35; Reject the null hypothesis
Step-by-step explanation:
Let
be the average life expectancy of its batteries.
As per given , we have
Null hypothesis : 
Alternative hypothesis : 
Since
is right-tailed and population standard deviation is also known, so we perform right-tailed z-test.
Test statistic : 
where, n= sample size
= sample mean
= Population mean
=population standard deviation
For
, we have

Critical one-tailed test value for 0.10 significance level :

Decision : Since critical z value (1.28) < test statistic (1.35), so we reject the null hypothesis .
[When critical value is less than the test statistic value , we reject the null hypothesis .]
Answer:
1) 2(t - 7)(t + 1)
2) $32,000
Step-by-step explanation:
v(t) = 2t² - 12t - 14
v(t) = 2(t² - 6t - 7) = 2(t - 7)(t + 1)
x = -b/2a = 6/2 = 3
y = 2(3)² - 12(3) - 14 = -32
(3, -32) means at 3 months, -32 thousand dollars
Answer:
39 hours
Step-by-step explanation:
52 × 45 = 2340
2340 mins into hours = 39 hours
hope this helps :)
Answer:
<em>dear </em><em>option</em><em> </em><em>C </em><em>(</em><em>2</em><em>,</em><em>4</em><em>,</em><em>6</em><em>)</em><em> </em><em>is </em><em>correct</em><em> </em><em>for </em><em>this </em><em>question</em>
<em>as,</em>
<em>domain </em><em>=</em><em> </em><em>is </em><em>all </em><em>set </em><em>of </em><em>input </em><em>values</em>
<em>and</em>
<em>range </em><em>=</em><em> </em><em>is </em><em>all </em><em>set </em><em>of </em><em>output </em><em>value</em>
<em><u>hope </u></em><em><u>this </u></em><em><u>answer </u></em><em><u>helps </u></em><em><u>u </u></em><em><u>dear!</u></em>
<u>ANSWER: </u>
The equation is y = 1.06x, so option D is correct.
<u>EXPLANATION:</u>
Given:
Amount Catherine is paid for an MP3 player=$159.00
The price paid includes a sales tax= 6%
To find:
Equations that can be used to determine the price of the MP3 player before tax?
Solution:
Now, we know that, total cost = selling price of item + sales tax on item
y = x + 6% of x
y = x + 
y = x + 0.06x
y = 1.06x
Hence, the equation is y = 1.06x, so option D is correct.