3 years ago

Irina ran 0.25 mile in 2 minutes. At this rate, how many minutes will it take her to run 2 miles?

Mathematics

2 answers:

Taya2010 [7]3 years ago

5 0

I think the answer is 16. Don’t get stressed!!
........

scoray [572]3 years ago

4 0

Answer:

Step-by-step explanation:

2/0.25 = 8

2 x 8 = 16

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A square with side x is changing with time where x(t)=3t+1. What is rate of change of the area of the square when t=2 seconds.

GuDViN [60]

Answer:

Rate of change of the area of the square is 42 units at t = 2.

Step-by-step explanation:

We note that the area of the square is given by: $A(x) = x^2$ but we aim to find $\frac{dA}{dt}$ . But we can use the chain rule to pull out that dA/dt. Doing so gives us:

$\frac{dA}{dt} = \frac{dA}{dx} \times \frac{dx}{dt}.$

Now, $\frac{dA}{dx} = 2x$ (by the power rule and $\frac{dx}{dt} = 3.$

But since we have "x" and not "t", we want to find what x is when t = 2. Substituting t = 2 gives us x(2) = 3(2) + 1 = 7.

So, finally, we see that:

$\frac{dA}{dt} = 2(7) \times 3 = 14 \times 3 = 42.$

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3 years ago

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natima [27]

Answer

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3 years ago

Plane B is flying 55mph

zysi [14]

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It takes around 5s for each plane to travel their respective distances.

Step-by-step explanation:

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