What is the answer to this problem, step by step 7 – (5t – 13) = –25

2 answers:

3 0

7
−
(
5
t
−
13
)
=
−
25
(Expand
−
(
5
t
−
13
)
)
7
−
5
t
+
13
=
−
25
(Simplify the equation)
20
−
5
t
=
−
25
(Minus
20
on both sides)
−
5
t
=
−
45
(Divide by
−
5
on both sides)
Answer-
t
=
9

Lubov Fominskaja [6]3 years ago

3 0

The answer is t = 9 because you start with distributing the parentheses then you add 7 and 14 then you bring the sum of that over to the other side but with the opposite sign then you divide whatever numbers in front of the variable and then that’s your answer

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A states division of motor vehicles claims that 60% of teens pass their drivers test on the first attempt. an investigative repo

____ [38]

Answer: There is convincing evidence at the the significance level that the DMV's claim is incorrect.

Step-by-step explanation:

Since we have given that

Hypothesis:

$H_0:p=0.6\\\\H_a:p\neq 0.6$

Probability of teens pass their drivers test on the first attempt = 60% = 0.60

Number of teens = 125

Number of them passed the tests on their first try = 86

$\hat{p}=\dfrac{86}{125}=0.688$

So, the value of test statistic would be

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\z=\dfrac{0.688-0.60}{\sqrt{\dfrac{0.6\times 0.4}{125}}}\\\\z=\dfrac{0.088}{0.0438}\\\\z=2.009\\\\z\approx 2.01$