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irinina [24]
3 years ago
10

Ahaha- I need help :,,)

Mathematics
2 answers:
Roman55 [17]3 years ago
6 0

Answer: 1 hour

Step-by-step explanation:

1st trip = 4mph

12 mi / 4 mi

12 mi = 3 hrs

2nd trip = 6 mph

12 mi / 6 mi

12 mi = 2 hrs

3hrs - 2 hrs = 1 hr

LiRa [457]3 years ago
5 0
18 in total I think ion really know
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A ladder is placed 7 feet from the base of a building and reaches a point on the building that is 24 feet above the ground.Find
Alinara [238K]
◆ Pythagoras Theoram ◆

Hey !!

Check the attachment.
Hope it helps you :)

5 0
3 years ago
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
2−2n=3n+17 whats the solution
Kazeer [188]
2-2n=3n+17
2= 5n+17
0= 5n+15
-15= 5n
-3= n
7 0
3 years ago
What is the x for x - 8 = -5
nika2105 [10]

Answer:

3

Step-by-step explanation:

add 8 to both sides then x=3

5 0
3 years ago
A salsa recipe uses green pepper, onion, and tomato in the extended ration 1 : 3 : 9. How many cups of onion are needed to make
Elanso [62]
Let x be a variable.

Using the ratio and the given number of 117, we can create the following formula:

1x + 3x + 9x = 117, where 3x is the cups of onion

Simplify this equation.

13x = 117

Divide both sides by 13

x = 9

We want to solve for 3x, so multiply both sides by 3

3x = 27

As I started earlier, 3x is how many cups of onions is needed; thus, 27 is our answer. Hope this helps! :)
7 0
3 years ago
Read 2 more answers
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