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Ber [7]
3 years ago
9

Perform the operation and reduce the answer fully. 1/10 + 2/9 =

Mathematics
1 answer:
larisa [96]3 years ago
8 0
You need to ensure the denominators are the same. To do this you multiply the denominators together.

1/90 + 2/90

However, this is incorrect, as you need to do the same to the numerators, so for the left hand side you multiplied by 9 and for the right hand side you multiplied by 10, so you must do the same for the numerators.

So it should be:

9/90 + 20/90

You can now add this together, to get:

29/90

This is triple checked so I’m not sure why it says reduce the answer fully as that is as far as it can be reduced.
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Humans can hear sounds with frequencies up to 20,000 Hz, while dolphins can hear sounds as high as 150,000 Hz. Write these numbe
Goshia [24]
20,000 Hz = 2 × 10^4 Hz

150,000 Hz = 1.5 × 10^5 Hz
4 0
3 years ago
Consider a drug testing company that provides a test for marijuana usage. Among 310 tested​ subjects, results from 28 subjects w
Naily [24]

Answer:

z=\frac{0.0903 -0.1}{\sqrt{\frac{0.1(1-0.1)}{310}}}=-0.569  

The p value for this case can be calculated with this probability:

p_v =P(z  

Since the p value is higher than significance level we don't have enough evidence to conclude that the true proportion is significantly less than 0.1

Step-by-step explanation:

Information given

n=310 represent th sample selected

X=28 represent the subjects wrong

\hat p=\frac{28}{310}=0.0903 estimated proportion of subjects wrong

p_o=0.1 is the value to verify

\alpha=0.05 represent the significance level

t would represent the statistic

p_v represent the p value

System of hypothesis

We want to test the claim that less than 10 percent of the test results are wrong ,and the hypothesis are:  

Null hypothesis:p\geq 0.1  

Alternative hypothesis:p < 0.1  

The statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the info we got:

z=\frac{0.0903 -0.1}{\sqrt{\frac{0.1(1-0.1)}{310}}}=-0.569  

The p value for this case can be calculated with this probability:

p_v =P(z  

Since the p value is higher than significance level we don't have enough evidence to conclude that the true proportion is significantly less than 0.1

5 0
3 years ago
Subtract. 8 ½ - 2 2/3 =
marissa [1.9K]

Answer:

Exact Form:

35/6

Decimal Form:

5.83333(infinite)

Mixed Number Form:

5  5/6

Hope this helps :)

8 0
3 years ago
Read 2 more answers
Melba saved $13,992 over an 11-year period. She saved the same amount each year. How much
svp [43]

Answer:

1272 dollars every year

Step-by-step explanation:

just divide the two numbers

7 0
3 years ago
Find the distance travelled (in meters) in the following.<br> at speed of 14m/s for 1 hour
Charra [1.4K]

Answer:

50400m

Step-by-step explanation:

t=1hour=60×60×60=3600

d=s×t

=14×3600

=50400m

3 0
3 years ago
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