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jasenka [17]
2 years ago
9

Please help me

Mathematics
1 answer:
Kruka [31]2 years ago
4 0

Answer:

ahm,nandito nato sa brainly but I think dimo nakita kaya heto nag copy nalang ako....

Step-by-step explanation:

Elena's running speed is 5 miles/hour

Explanation:

The speed is defined as the covered distance per unit time

In the problem, we have:

The distance covered is the length (circumference) of the circular track which is given as \frac{1}{4}

4

1

I'm

of a mile.

We are also given that she completes each lap (she completes \frac{1}{4}

4

1

of a mile) in \frac{1}{20}

20

1

of an hour

To get her speed, we will divide the distance covered by the time taken to cover this distance

This is done as follows:

speed = \frac{\frac{1}{4} }{\frac{1}{20} } = 5

20

1

4

1

=5 miles/hour

This means that:

Elena can run 5 miles each hour

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(2,-3) is the answer

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Limit of x^2-81/x+9<br> As x goes toward -9
Semmy [17]
Hello,

Use the factoration

a^2 - b^2 = (a - b)(a + b)

Then,

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x^2 - 9^2 = ( x - 9).(x + 9)

Then,

Lim (x^2- 81) /(x+9)

= Lim (x -9)(x+9)/(x+9)

Simplity x + 9

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Now replace x = -9

Lim ( -9 -9)

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_______________

The second method without using factorization would be to calculate the limit by the hospital rule.

Lim f(x)/g(x) = lim f(x)'/g(x)'

Where,

f(x)' and g(x)' are the derivates.

Let f(x) = x^2 -81

f(x)' = 2x + 0
f(x)' = 2x

Let g(x) = x +9

g(x)' = 1 + 0
g(x)' = 1

Then the Lim stay:

Lim (x^2 -81)/(x+9) = Lim 2x /1

Now replace x = -9

Lim 2×-9 = Lim -18

= -18




7 0
3 years ago
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Answer: same

Step-by-step explanation:

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