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ra1l [238]
3 years ago
8

4.2x - 1.4y = 2.1 solve for y

Mathematics
2 answers:
PSYCHO15rus [73]3 years ago
4 0
4.2x-1.4y=2.1
-4.2x        -4.2x
____________
  1.4y = -2.1x
(10)            (10)
_____________
 y= - 3x/2
garri49 [273]3 years ago
3 0

we have

4.2x-1.4y=2.1

Solve for y------> that means isolate the variable y

Subtract 4.2x both sides

4.2x-1.4y-4.2x=2.1-4.2x

-1.4y=2.1-4.2x

Divide by -1.4 both sides

y=-\frac{2.1}{1.4} +\frac{4.2}{1.4}x \\ \\y=3x-1.5

therefore

<u>the answer is</u>

y=3x-1.5

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Sydney invested $440 in an account paying an interest rate of 5.6% compounded daily. Assuming no deposits or withdrawals are mad
stealth61 [152]

Answer:

The time required to get  a total amount of $ 640.00  from compound interest on a principal of $ 440.00  at an interest rate of 5.6% per year  and compounded 365 times per year  is approximately 7 years.

Step-by-step explanation:

Given

  • Principle Amount P = $440
  • Accrued Amount A = $640
  • Interest rate r = 5.6% = 0.056
  • Compounded daily n = 365

To determine:

Time period t = ?

Using the formula

A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{nt}

solving for t

t = ln(A/P) / n[ln(1 + r/n)]

substituting the values A = 640, P = 440, n = 365 and r = 0.056

t = ln(640/440) / ( 365 × [ln(1 + 0.00015342465753425/365)] )

t = 6.691

t ≈ 7  (nearest year)

Therefore, the time required to get  a total amount of $ 640.00  from compound interest on a principal of $ 440.00  at an interest rate of 5.6% per year  and compounded 365 times per year  is approximately 7 years.

4 0
3 years ago
For each gym membership sold, the gym keeps $42 and the employee who sold it gets $8. What is the commission the employee earned
horrorfan [7]

Answer:

Commission of the employee = 16%

Step-by-step explanation:

It is given that:

Amount kept by gym = $42

Amount given to employee = $8

Total fee = 42 + 8 = $50

Commission rate = \frac{Commission}{Total\ fee}*100

Commission rate = \frac{8}{50}*100

Commission rate = 0.16 * 100 = 16%

Therefore,

Commission of the employee = 16%

4 0
3 years ago
Read 2 more answers
Answer this now please :)
natta225 [31]

9514 1404 393

Answer:

  E.  384 cu ft

Step-by-step explanation:

The sum of length and width is half the perimeter, so the width is ...

  (40/2) -12 = 8 . . . feet

The depth is half that, so is 8/2 = 4 feet.

The volume is ...

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3 years ago
Standard Form: 3x+4y=−16
Gnesinka [82]

Answer:

i know the answer

Step-by-step explanation:

8 0
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Of the employees who work at stalling printing 90% attened the safety procedures meeting. If 63 employees attended the meeting h
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90% of what is 63....

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