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GenaCL600 [577]

3 years ago

14

Thirty car pass through a certain toll booth each minute.at that rate,how many cars are expected to pass through the toll booth

each half-hour
A 15
B 60
C 450
D 900

2 answers:

BigorU [14]3 years ago

8 0

D. 30 Cars p/m x 30 min = 900

vlabodo [156]3 years ago

8 0

Answer:

The answer is D. 900

Step-by-step explanation:

It's right on Edgenuity, hope this helps! :)

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Michael drives 30 miles in 5 hours. How many miles can he drive in 8 hours?

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In 8 hours, Michael can drive 48 miles.

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<u>Let's write our equation.</u>

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2 years ago

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A tank with a capacity of 100 gallons initially contains 50 gallons of water with 10 pounds of salt in solution. fresh water ent

steposvetlana [31]

Let $A(t)$ be the amount of salt (in pounds) in the tank at time $t$ . We're given that $A(0)=10\text{ lb}$ .

The rate at which the amount of salt in the tank changes is given by the ODE

$A'(t)=\dfrac{2\text{ gal}}{1\text{ min}}\cdot\dfrac{0\text{ lb}}{1\text{ gal}}-\dfrac{1\text{ gal}}{1\text{ min}}\cdot\dfrac{A(t)\text{ lb}}{50+(2-1)t\text{ gal}}$

$A'(t)+\dfrac{A(t)}{50+t}=0$

$(50+t)A'(t)+A(t)=0$

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$A(t)=\dfrac C{50+t}$

Given that $A(0)=10$ , we find that

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The tank will be filled when $50+t=100$ , or after $t=50$ minutes. At this time, the amount of salt in the tank is

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1 year ago