2 years ago

An object moves 100 m in 4 s and then remains at rest for an additional 1 s.

Mathematics

1 answer:

nydimaria [60]2 years ago

8 0

Answer:

20 m per second

Step-by-step explanation:

100 / 5 = 20

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louise bought 80 metres of fencing to make an enclosure for her pet dog .tommy if louise expects a rectangular enclosure what is

OleMash [197]

Answer:

400 m^2.

Step-by-step explanation:

The largest area is obtained where the enclosure is a square.

I think that's the right answer because a square is a special form of a rectangle.

So the square would be 20 * 20 = 400 m^2.

Proof:

Let the sides of the rectangle be x and y m long

The area A = xy.

Also the perimeter 2x + 2y = 80

x + y = 40

y = 40 - x.

So substituting for y in A = xy:-

A = x(40 - x)

A = 40x - x^2

For maximum value of A we find the derivative and equate it to 0:

derivative A' = 40 - 2x = 0

2x = 40

x = 20.

So y = 40 - x

= 40 - 20

=20

x and y are the same value so x = y.

Therefore for maximum area the rectangle is a square.

3 0

3 years ago

The seventh-grade class is building target areas for a PE activity. The bases for the game will be in a circular shape. The diam

lys-0071 [83]

By definition, the area of a circle is given by:
$A = \pi * r ^ 2
$
Where,
r: radius of the circle.
Substituting the values in the given expression, we have:
$A = 3.14 * (3) ^ 2

 A = 28.26 feet ^ 2$
Rounding to the nearest tenth we have:
$A=28.3feet^2$
Answer:
Approximately needed:
$A=28.3feet^2$

4 0

3 years ago

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Helpppppppp plzzzzzzzzzzzz!

agasfer [191]

180- 124= 56

So 56 degrees

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3 years ago

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Can somebody check if i did this right (btw u its supposed to be alone)?

yarga [219]

Yes you did it right