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zmey [24]
4 years ago
7

Can someone show me the workings out to this please

Mathematics
1 answer:
777dan777 [17]4 years ago
7 0
Ummm the way I learned I would make the equations equal to each other. So it would be 50=4K-10. I hope this helped
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It takes Ms. Campbell 5 times as long as it takes Ms. Dorsey to paint a room. If Ms. Dorsey
Aliun [14]

Answer:

Dorsey = 4.8 hours

Campbell = 24 hours

Step-by-step explanation:

It takes "x" hours for Dorsey

So, it will take 5 times more for Campbell, so

It takes "5x" hours for Campbell

Rate is inverse of time, so rates are:

Dorsey: 1/x

Campbell: 1/5x

We know Rate * Time = Work

When together, it takes 4 hours to finish a work, so we can write:

(\frac{1}{x}+\frac{1}{5x})4=1

Solving for x, we get the time of Dorsey:

(\frac{1}{x}+\frac{1}{5x})4=1\\(\frac{1}{x}+\frac{1}{5x})=\frac{1}{4}\\\frac{5+1}{5x}=\frac{1}{4}\\\frac{6}{5x}=\frac{1}{4}\\5x=24\\x=4.8

Dorsey takes 4.8 hours alone

Campbell takes 4.8 * 5 = 24 hours alone

7 0
3 years ago
In which quadrant does the point (-21, -11) lie?
FromTheMoon [43]

Answer:

The 3rd quadrant, where the x and y are both negative.

5 0
3 years ago
A jar contains 7 orange, 3 yellow, and 5 blue marbles. If you pick one without looking, what is the probability that the marble
Softa [21]

Answer:

The probability would be 5/15 or 1/3

Total = 7+3+5

= 15

yellow = 3

orange = 7

blue marbles = 5

6 0
4 years ago
Read 2 more answers
An equation is shown below: −2(4x − 1) − 7 = 5 Which statement shows a correct next step in solving the equation?
LuckyWell [14K]
B. The equation can become −2(4x − 1) = 12 by applying the addition property of equality because we have: <span>−2(4x − 1) − 7 = 5 / + 7 <=> -2(4x-1) = 12;</span>
6 0
4 years ago
Riley invested $8,500 in an account paying an interest rate of 3.8% compounded daily. Assuming no deposits or withdrawals are ma
Tems11 [23]

Answer:

First we subtract 8,500 from the 18,040. What we get from that is 9540. Now we divide 9,540 by 3.8 and see what we get. What we get is 2510.52631579 which means it would take around 2510.52631579 days to pay 18,040. In total that rounds to 7 years. Rounding up by the way

Step-by-step explanation:

6 0
3 years ago
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