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sleet_krkn [62]
2 years ago
14

Plz solve this pic fast and correctly!!!

Mathematics
1 answer:
Leni [432]2 years ago
6 0

Answer:

mi = 45(hr)

  hr = mi/45

Step-by-step explanation:

Distance = 45 mph times the number of hours (time)   D = 45t  

time in hours = the number of miles (Distance) divided by 45 mph  t = D/45

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Select all the equations that have the same solution as 3x - 12=24
USPshnik [31]

Answer:

none of the above.

Step-by-step explanation:

hope this helps you!!

8 0
3 years ago
Use distrubitive property to rewrite this question -7(x-10)
Degger [83]
The answer is: =-7x+70
6 0
3 years ago
-2(x+5)=4 Can someone explain I need an one number answer.
Irina18 [472]

Answer:

7

Explanation:

−

2

x

+

10

=

−

4

take 10 from both sides

−

2

x

=

−

14

divide both sides by -2 to find x

x

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7

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
Suppose you read online that children first count to 10 successfully when they are 32 months old, on average. You perform a hypo
creativ13 [48]

Answer:

p_v =2*P(t_{(35)}  

Step-by-step explanation:

Assuming this info from R

hist(gifted$count)

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.  

##   21.00   28.00   31.00   30.69   34.25   39.00

## Sd

## [1] 4.314887

Data given and notation  

\bar X=30.69 represent the mean  

s=4.3149 represent the sample standard deviation

n=36 sample size  

\mu_o =32 represent the value that we want to test

\alpha 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 mean is different than 32, the system of hypothesis would be:  

Null hypothesis:\mu = 32  

Alternative hypothesis:\mu \neq 32  

If we analyze the size for the sample is > 30 but we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

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

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

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

t=\frac{30.69-32}{\frac{4.3149}{\sqrt{36}}}=-1.822    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=36-1=35  

Since is a two sided test the p value would be:  

p_v =2*P(t_{(35)}  

7 0
3 years ago
Helllpppppppppppppppp asap 22 pts
Rama09 [41]
<span>The image gives the interval of the values of a data set. It is the difference between the highest number and the lowest number in a dataset. It summarizes all the values of a data with a single number. (3). Since the data has no outlier, the mean will be the best measure of central tendency to describe the score.</span>
5 0
3 years ago
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