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AfilCa [17]
2 years ago
9

Write an expression equivalent to 4-2(x+5) that has two terms

Mathematics
2 answers:
Vikentia [17]2 years ago
7 0

Answer: 2x+14

Step-by-step explanation:4-2x+10 = 2x+14

maw [93]2 years ago
5 0

Answer:

2x+10

hope this helps

have a good day :)

Step-by-step explanation:

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A county is considering rasing the speed limit on a road because they claim that the mean speed of vehicles is greater than 30 m
DochEvi [55]

Answer:

No, at alpha equals 0.10​, we do not have enough evidence to support the​ county's claim.

Step-by-step explanation:

We are given that a county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 30 miles per hour.

A random sample of 15 vehicles has a mean speed of 31 miles per hour and a standard deviation of 4.7 miles per hour.

<em><u>Let </u></em>\mu<em><u> = true mean speed of the vehicles.</u></em>

SO, <u>Null Hypothesis</u>, H_0 : \mu \leq  30 miles per hour   {means that the mean speed of vehicles is lesser than or equal to 30 miles per hour}

<u>Alternate Hypothesis,</u> H_A : \mu > 30 miles per hour   {means that the mean speed of vehicles is greater than 30 miles per hour}

The test statistics that will be used here is <u>One-sample t test statistics</u> as we don't know about the population standard deviation;

                        T.S.  = \frac{\bar X -\mu}{\frac{s}{\sqrt{n} } }  ~ t_n_-_1

where, \bar X = sample mean speed of 15 vehicles = 31 mph

             s = sample standard deviation = 4.7 mph

             n = sample of vehicles = 15

So, <em><u>test statistics</u></em>  =   \frac{31-30}{\frac{4.7}{\sqrt{15} } }  ~ t_1_4

                               =  0.824

<u><em>Hence, the value of test statistics is 0.824.</em></u>

<em />

<em>Now at 0.10 significance level, the t table gives critical value of 1.345 at 14 degree of freedom for right-tailed test. Since our test statistics is less than the critical value of t as 0.824 < 1.345, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region.</em>

<em />

Therefore, we conclude that the mean speed of vehicles is lesser than or equal to 30 miles per hour which means that the county's claim is not supported.

4 0
3 years ago
Can someone help me please
LenaWriter [7]

Answer:

the correct graph is b for this problem

8 0
3 years ago
The expression 20l + 25g - 10 gives the number of dollars that Josie makes from mowing lawns and raking gardens.
vodka [1.7K]
20l + 25g -10
replace G with 4 and L with 3

20(3) + 25(4) - 10

60 + 100 - 10

160 - 10

150

he made $150
4 0
3 years ago
I need help on this!
marshall27 [118]
That is a 45 45 90 triangle.
The legs of such a triangle equal the hypotenuse divided by the sq root of 2
So each leg equals 125.5 cm divided by <span> <span> <span> 1.4142135624 </span> </span> </span> which equals
<span> <span> <span> 88.7419010389 </span> </span> </span> or to the nearest 100th of a centimeter:
88.74


3 0
3 years ago
What is 3/4 of 60 step step
dem82 [27]

Answer:

45

Step-by-step explanation:

3/4 of 60 would be:

= 3/4 * 60

= 3*60 / 4

= 180 / 4

= 45

Hope this help you :3

5 0
2 years ago
Read 2 more answers
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