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Yuri [45]
3 years ago
11

If you could just refresh me on how to do this, thanks.

Mathematics
1 answer:
Masteriza [31]3 years ago
8 0
I'm pretty sure it's D
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Rosita can wax her car in 2 hours or 120 minutes. When she works together with Helga, they can wax the car in 45 minutes. How lo
Mashcka [7]
<h2>Time taken by Helga to wax the car is 72 minutes</h2>

Step-by-step explanation:

Let w be the work of waxing.

Rosita can wax her car in 2 hours or 120 minutes.

Time taken by Rosita = 120 minutes

\texttt{Rate of Rosita = }\frac{W}{120}

Let time taken by Helga be t,

\texttt{Rate of Helga = }\frac{W}{t}

When she works together with Helga, they can wax the car in 45 minutes.

We have

             \frac{W}{\frac{W}{120}+\frac{W}{t}}=45\\\\120t=45(120+t)\\\\120t=5400+45t\\\\t=72minutes

Time taken by Helga to wax the car is 72 minutes

6 0
3 years ago
Help me please!!! I will give Brainly if correct!
Alexxandr [17]

Answer:

B, 20mph

Step-by-step explanation:

540 miles in 27 hours is 540/27 = 20 miles in 1 hour. This is 20 mph

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irina [24]
The answer is 148, what grade are you in that’s really easy unless you didn’t pay attention. , anyways keep up
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Which of these equations or inequalities below are true 4 - 5&lt; -2
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Step-by-step explanation:

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