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AysviL [449]
3 years ago
6

Ben Frank is an electrician who installs lighting fixtures. He charges (in dollars) his clients 15h+40f15h+40f where hh is the n

umber of hours worked and ff is the number of fixtures installed.
How much does Ben Frank charge when he works 77 hours and installs 99 fixtures?
Mathematics
2 answers:
VikaD [51]3 years ago
8 0
H is the numbers of hours worked, so you plug in 77 for h.
f is the number of fixtures installed, so you plug in 99 for f.
aleksandrvk [35]3 years ago
6 0
Hey I wanna is the day you got your head out and then you gotta was the night you were
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All of the angles are exterior angles EXCEPT:
MaRussiya [10]

Answer:

Step-by-step explanation:

XYZ

The first one

I hope I helped you.

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3 years ago
There are 40% more black balls than white balls in a bag.
Paladinen [302]
There is no answer to this question.

4 0
3 years ago
The average household income for a recent year was $30,000. five years earlier the average household income was $24,500. assume
ikadub [295]

Using hypothesis test, we conclude that there is evidence to believe that the average household income has increased.

According to the question,

The average household income for a recent year (x₁⁻) = $30,000

The average household income for a recent year (x₂⁻) = $24,500

sample sizes n₁ = n₂ = 34

standard deviation of both samples were $24,500. Thus, s₁ = s₂ = $5928.

Null hypothesis:  There is no evidence to believe that the average household income has increased.

H₀ : μ₁ ≤ μ₂

Alternative hypothesis:  There is evidence to believe that the average household income has increased.

H₁: μ₁ > μ₂  

To check hypothesis we have the formula

Standard error=  \sqrt{\frac{s_{1} ^{2} }{n_{1} } + \frac{s^{2} _{2} }{n_{2} }  }

= \sqrt{2067128.4706}

= 1437.7512

Thus, standard error is $1437.7512.

Formula for test statistic = [(x₁⁻ -  x₂⁻) - (μ₁ - μ₂)]/standard error

= [(30000 -  24500) - 0]/1437.7512

= 3.8254

The critical value of z at 5% level of significance is 1.6449.

Here, the calculated value is greater than the critical value so we reject H₀.

Hence using hypothesis test, we conclude that there is evidence to believe that the average household income has increased.

Learn more about hypothesis test here

brainly.com/question/15060525

#SPJ2

3 0
2 years ago
What are the x and y-intercepts of the line described by the equation?
tatuchka [14]

Answer: x=4.41 y= -7.35

Step-by-step explanation:

Pretty basic just graph them using Desmos...

Showing your work you would need to get x on one side then y on the other.

Because 3y is positive I personally like to use that one first. The inverse operation of 3y is divide so you divide 3y by 3 and the 3s cancel out. Divide -22.05 by 3 and you get -7.35. Which is your y value.

Finding X is a bit more difficult, you need to divide by -5 which is the obvious inverse operation. So, -22.05/-5 and you get 4.41. Which is your X value.

Any further questions feel free to contact me.

-Vy

5 0
3 years ago
Kira has $15 in her savings account. She will get $5 per week for her allowance. Write an expression to represent the amount of
Fudgin [204]

Answer:

3??

Step-by-step explanation:

Im saying 3 because i need to know when it will end, If you divide it by 5 it will say 3 now you can delete this or something if im wrong, You really have not described how much she will have at the end of the week.

6 0
2 years ago
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