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3 years ago

12

The length of each side of a square increases by 2.5 inches to form a new square with a perimeter of 70 inches. The length of ea

ch side of the original square was inches.

1 answer:

densk [106]3 years ago

6 0

Check the picture below.

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A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed

Olegator [25]

Answer:

The length of shadow decrease at 0.48 m/s.

Step-by-step explanation:

The distance of man from building = x

Thus initially, x = 12

It is given that dx/dt= -1.3 m/s

Let the shadow height = Y

Now solve for the $dy/dt$ when x=4

from the diagram (triangle) it can be seen similar triangles with similar base/height ratios.

$\frac{2}{12-x} = \frac{y}{12} \\Y = \frac{24}{12 - x} \\ \frac{dy}{dt} = \frac{24}{(12-x)^{2}} \times \frac{dx}{dt} \\at x=4, dy/dt \ becomes: \\\frac{24}{(12-4)^2} \times -1.3 \\= -0.48 m/s$

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3 years ago

Alex sold 330 candy bars, milk chocolate candy bars sold for $2 each and white chocolate candy bars sold for $3 each. Alex sold

Alinara [238K]

Answer:

<em>Alex sold 330 white chocolate bars</em>

Step-by-step explanation:

let the milk chocolate candy be x and the white chocolate candy be y. then

then 2x+3y=990----1)

x+y=330-----2)

from eq 2) ⇒ x=330-y---------3)

Putting eq 3 in eq 1

2(330-y) +3y=990

660-2y+3y=990

y=990-660=330-----------4)

Putting eq4 in eq1

2x+3(330)=990

2x+990=990

2x=990-990

2x=0

x=0---------------------------5)

4 0

3 years ago

Round 6.5472 to<br> the hundredths place.

Ugo [173]

Answer:

6.5500

Step-by-step explanation:

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3 years ago

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Sara would like to open a bank account. What will she need to do this? Check all that apply.

svet-max [94.6K]

Where are the examples?

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3 years ago

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Gender Students

alukav5142 [94]

Answer:

the answer is 44. . .

Step-by-step explanation:

20+24 =44

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2 years ago