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4vir4ik [10]
3 years ago
8

Tess earned $52 for 4 hours of shoveling snow and $71.50 for 5.5 hours of shoveling snow. How long would she have to shovel snow

to earn $39
Mathematics
2 answers:
Deffense [45]3 years ago
6 0
52/4 = 13
$13 = 1 hour.
$6.50 = halfhour

13 x 3 = $39
She would have to work for 3 hours to earn $39
sp2606 [1]3 years ago
6 0
52/4 = 13
$13 = 1 hour.
$6.50 = halfhour

13 x 3 = $39
She would have to work for 3 hours to earn $39
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a circular oil slick is expanding at a rate of 2m^2/h. Find the rate at which it's diameter is expanding when it's radius is 1.5
aleksandrvk [35]

Answer:  \frac{4\pi}{3} \text{ meter per hour}

Step-by-step explanation:

The circular oil slick is expanding at a rate of  2 m^2/h

Let A be the area of the circular oil slick,

So, the changes in  A with respect to time (t),

\frac{dA}{dt} = 2

\frac{d(\pi r^2)}{dt} = 2

2\pi r\frac{dr}{dt} = 2

\frac{dr}{dt} = \frac{1}{\pi r}  

Also, the change in diameter with respect to time(t),

\frac{d}{dt} (2 r) = 2 \frac{dr}{dt}

\frac{d}{dt} (2 r) = 2 \times \frac{1}{\pi r}

\frac{d}{dt} (2 r) = \frac{2}{\pi r}

For r = 1.5 m,

\frac{d}{dt} ( 2 r)]_{r=1.5} = \frac{2}{\pi \times 1.5}=\frac{20}{\pi \times 15}=\frac{4\pi }{3}\text{ meter per hour}




7 0
3 years ago
16−(7m+3)=8(1−m)<br><br> what is m
Ivan

Answer:

m = -5

Step-by-step explanation:

16−(7m+3)=8(1−m)

16 - 7m - 3 = 8 - 8m

16 - 3 - 8 = 7m - 8m

5 = -m

(-1) * 5 = -m * (-1)

-5 = m

therefore, m = -5

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Nadya [2.5K]

Answer:

I think it is A as it make more sense

Step-by-step explanation:

Sorry if I'm wrong

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