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dalvyx [7]
2 years ago
11

if noah ran 45 minutes and john ran 6 more minutes the noah how many minutes did john run? please help

Mathematics
1 answer:
pychu [463]2 years ago
7 0

Answer:51 minutes

Step-by-step explanation:

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A zoo train ride costs $3 per adult and $1 per child. On a certain day, the total number of adults (a) and children (c) who took
PIT_PIT [208]
A=adult
c=children
total lumber=30
total number=adults+children
a+c=30

total cost=50
total cost=acost+ccost

acost=a times cost per adult=a times 3=3a
ccost=c times cost per child=c tiems 1=1c=c
total cost=3a+c
50=3a+c

equiaotn are
a+c=30
3a+c=50
multiplyu first by -1 and add
3a-a+c-c=50-30
2a=20
a=10
sub
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answer is A
4 0
3 years ago
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I just need help with the second one.
NISA [10]

Answer:

(90 - y) °

Step-by-step explanation:

Complement of angle A = 90° - y° = (90 - y) °

7 0
3 years ago
According to the Census Bureau, 3.39 people reside in the typical American household. A sample of 26 households in Arizona retir
Vikki [24]

Answer:

t=\frac{2.73-3.39}{\frac{1.22}{\sqrt{26}}}=-2.758    

df=n-1=26-1=25  

p_v =P(t_{(25)}  

Since the p value is lower than the significance level 0.1 we have enough evidence to reject the null hypothesis, and we can conclude that the true mean is significanlty lower than 3.39 personas at 10% of significance.

Step-by-step explanation:

Data given and notation  

\bar X=2.73 represent the sample mean

s=1.22 represent the sample standard deviation

n=26 sample size  

\mu_o =3.39 represent the value that we want to test

\alpha=0.1 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is less than 3.39 persons, the system of hypothesis would be:  

Null hypothesis:\mu \geq 3.39  

Alternative hypothesis:\mu < 3.39  

The statistic is given by:

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{2.73-3.39}{\frac{1.22}{\sqrt{26}}}=-2.758    

P-value

The degreed of freedom are given by:

df=n-1=26-1=25  

Since is a one sided lower test the p value would be:  

p_v =P(t_{(25)}  

Conclusion  

Since the p value is lower than the significance level 0.1 we have enough evidence to reject the null hypothesis, and we can conclude that the true mean is significanlty lower than 3.39 personas at 10% of significance.

3 0
3 years ago
I will get my points but answer it correctly and no LINKS!!! (factotise by using a suitable identity X5-X) ​
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x(x-1)(x+1)(x²+1)=0

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3 years ago
What is the simplified form of this rational expression? 6x^2-54/5x^2+15x
NeX [460]
Factor the numerator and denominator then simplify.

6x^2 - 54          6(x^2 - 9)          6(x + 3)(x - 3)        6(x - 3)
--------------  =    -------------     =  ------------------  =  ------------
5x^2 + 15x      5x(x + 3)            5x(x + 3)                5x


6(x - 3)
----------
5x
7 0
3 years ago
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