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3 years ago

Please help ill mark brainliest!

Mathematics

1 answer:

Sedbober [7]3 years ago

8 0

So to find the area of a rectangle you would use the formula A = L • W. So the actual dinning hall is 9 • 3 = 18; 18cm would be your area.

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A woman rides a bicycle for 1 hour and travels 12 kilometers. Find the angular velocity of the wheel if the radius

Korolek [52]

14.81 radians/second

Step-by-step explanation:

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2 years ago

4.2 times what equals 6

Bumek [7]

It would be <span>1.42857142857.
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3 years ago

Ms. Manko has 4 grams of sprinkles

lukranit [14]

4 divided by 12 is 1/3.
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2 years ago

The value of a $120,000 house increases by 1.3% per year.

Nitella [24]

Answer:

a. exponential growth

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5 0

2 years ago

A street light is at the top of a 25 ft pole. A 4 ft tall girl walks along a straight path away from the pole with a speed of 6

Burka [1]

Answer:

Tip of the shadow of the girl is moving with a rate of 7.14 feet per sec.

Step-by-step explanation:

Given : In the figure attached, Length of girl EC = 4 ft

Length of street light AB = 25 ft

Girl is moving away from the light with a speed = 6 ft per sec.

To Find : Rate ( $\frac{dw}{dt}$ ) of the tip (D) of the girl's shadow (BD) moving away from th

light.

Solution : Let the distance of the girl from the street light is = x feet

Length of the shadow CD is = y feet

Therefore, $\frac{dx}{dt}=6$ feet per sec. [Given]

In the figure attached, ΔAFE and ΔADE are similar.

By the property of similar triangles,

$\frac{x}{21}=\frac{x+y}{25}$

25x = 21(x + y)

25x = 21x + 21y

25x - 21x = 21y

4x = 21y

y = $\frac{4x}{21}$

Now we take the derivative on both the sides,

$\frac{dy}{dt}=\frac{4}{21}\times \frac{dx}{dt}$

= $\frac{4}{21}\times 6$

= $\frac{8}{7}$

≈ 1.14 ft per sec.

Since w = x + y

Therefore, $\frac{dw}{dt}= \frac{dx}{dt}+\frac{dy}{dt}$

$\frac{dw}{dt}=6+1.14$

= 7.14 ft per sec.

Therefore, tip of the shadow of the girl is moving with a rate of 7.14 feet per sec.

3 0

3 years ago