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3 years ago

5

Lisa had a set of 12 toys cars.Then she gave her sister 3.What fraction of Lisa's set did Lisa give her sister. A 3/4 B 1/4 C 2/

3 D 1/3

2 answers:

love history [14]3 years ago

4 0

Lisa fraction is 1/4,but it could be a

nexus9112 [7]3 years ago

3 0

B 1/4 because 12/3 equals 4 so she only gave 1 of the 4 she had so the answer would be 1/4

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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

While researching Facts on the planet earth Kate learned that a true earth day is about 23.93 hours long how many hours are in 2

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Answer:

335.02

Step-by-step explanation:

Just multiply 23.93 by 14 which is 2 weeks

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Which expression has the same value as 4x – 3y?

coldgirl [10]

Answer:

4x+(-3y)

Step-by-step explanation:

$\\ \rm\longmapsto 4x+(-3y)$

(-)(-)=(+)
(+)(-)=(-)
(-)(+)=(-)
(+)(+)=(+)

$\\ \rm\longmapsto 4x-3y$

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ra1l [238]

It cost 5 per game , hope it helps

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3 years ago

How tall is the towerr

skad [1K]

Answer:

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Step-by-step explanation

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