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3 years ago

7. Mike earns $12.00 per hour at a restaurant. On Thursday he spent 1 1/4 hours on

Mathematics

1 answer:

Goryan [66]3 years ago

6 0

$68.60 would be the correct answer

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Solve the system by substitution. 3x + y = 20 -7y=x Please help

alisha [4.7K]

9514 1404 393

Answer:

(x, y) = (7, -1)

Step-by-step explanation:

The expression for x makes it easy to use that for substitution.

3(-7y) +y = 20

-20y = 20 . . . . . collect terms

y = -1 . . . . . . . . . divide by -20

-7(-1) = x = 7 . . . use y in the second equation to find x

The solution is (x, y) = (7, -1).

8 0

3 years ago

High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers

Maurinko [17]

Answer:

The 99% of a confidence interval for the average maximum HP for the experimental engine.

(536.46, 603.54)

Step-by-step explanation:

Step:-1

Given that the mean of the Population = 540HP

Given that the size of the sample 'n' = 9

Given that the mean of the sample = 570HP

Given that the sample standard deviation = 30HP

Step(ii):-

Degrees of freedom = n-1 =9-1 =8

t₀.₀₀₅ = 3.3554

The 99% of a confidence interval for the average maximum HP for the experimental engine.

$(x^{-} - t_{\frac{0.01}{2} ,8} \frac{S.D}{\sqrt{n} } ,x^{2} + t_{\frac{0.01}{2},8 } \frac{S.D}{\sqrt{n} } )$

$(570-3.354\frac{30}{\sqrt{9} } , 570+3.354\frac{30}{\sqrt{9} } )$

(570 - 33.54 , 570+33.54)

(536.46 , 603.54)

Final answer :-

The 99% of a confidence interval for the average maximum HP for the experimental engine.

(536.46, 603.54)

4 0

3 years ago

(6,5), 7x-3y=5 find the equation of the line that contains the given point and is parallel to the line. write the equation in sl

SVEN [57.7K]

Answer:

y = (7/3)x - 9

Step-by-step explanation:

1. Convert given equation to y=mx+b form --> y = (7/3)x - 5/3

2. Equation of new line --> y = (7/3)x + b

Note: 7/3 is the slope and for lines to be parallel they need the same slope so both equations have 7/3.

3. Plug in given values --> 5 = (7/3)(6) + b

4. Solve for b --> b = 5 - 14 b = -9

5. New line --> y = (7/3)x - 9

7 0

2 years ago

Find 19/25 of $25,000 A. $2,500 B.$15,000 C.$19,000 D.$1,900

Alla [95]

I am thinking A) Or B) because iPlease chose as best if i am wrong please don't be mad most of my stuff is correct

5 0

3 years ago

What is the value of the variable in the equation, 83=y-99 *

soldier1979 [14.2K]

Answer: y= 182

Step-by-step explanation:

flip equation (y-99=83) and add 99 to both sides. the two 99's will cancel and 83+99 is 182 whihc is the answer.

5 0

3 years ago

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