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algol13
3 years ago
15

I really need help with this please I keep getting it wrong and I’m confused

Mathematics
1 answer:
Nikitich [7]3 years ago
5 0
18+5= n
n= 23
D. 23
15+5=20 so u just gotta add 5 to 18
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Jaelyn works 6 hours per day on Thursday, Friday and Saturdays each week. She
VladimirAG [237]

Answer:

1,363.5

Step-by-step explanation:

$15.15 ×6 =90.9(for Thu,Fri,sat)

15.15×24=363.6(for other days)

90.9×3=272.7(total for Thursday, Friday and Saturdays)

363.6× 3( include other days like Monday Tuesday and Wednesday)

1,090.8

therefore total for 6hours days and full days

1,090.8+272.7=1,363.5

7 0
2 years ago
A researcher obtained M = 27 for a sample of n = 36 scores selected from a population with µ = 30 and σ = 18. This sample mean c
dusya [7]

Answer:

True

Step-by-step explanation:

Given that:

M = 27, sample of n = 36 scores, µ = 30 and σ = 18.

The z score is used in statistics to determine by how many standard deviations the raw score is above or below the mean. If the z score is positive, the raw score is greater than the mean and if the z score is negative the raw score is less than the mean. The z score is given as:

z=\frac{x-\mu}{\sigma}

Given that M = 27, this means that x = 27. Therefore:

z=\frac{x-\mu}{\sigma}\\\\for \ a\ sample\ size(n):z=\frac{x-\mu}{\sigma/\sqrt{n} }\\\\z=\frac{27-30}{18/\sqrt{36} } =\frac{-3}{3}=-1

This sample mean corresponds to a z-score of z = –1.00.

7 0
3 years ago
What is the volume of a rectangular prism with a length of 12ft, a width of 10ft, and a height of 18ft?
photoshop1234 [79]

Answer:

2160ft³

Step-by-step explanation:

V=whl=10·18·12=2160ft³

7 0
3 years ago
Verify if this is an identity <br>cot(-x) tanx=-1
12345 [234]
<span>hello :
</span>cot(-x) tan(x)=-1......(*)
* cot(x) = 1/tan(x)
 cot(-x) = -cot(x)= -(1/tan(x))

                       cot(-x) tan(x) =   -(1/tan(x))×tan(x)=-1

7 0
3 years ago
you are traveling down the interstate averaging 50 MPH. How much has passed when you have traveled 120 miles?
kirill [66]
I assume you are asking how much time has passed
now, we can set up a proportion with this:
let x = time(in hours)
\frac{120miles}{50miles} = \frac{x}{1 hour}
we cross multiply to get:
50x=120
divide both sides by 50 to get:
x= \frac{120}{50} =2.4= \frac{12}{5}=2 \frac{2}{5} hours
3 0
3 years ago
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