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3 years ago

8

The mean weight of 3 people in a lift was 68kg. If 2 of them weighed 58kg each, how much did the third person weigh?

2 answers:

rusak2 [61]3 years ago

7 0

Answer:

88kg

Step-by-step explanation:

Mean= sum of weights/ Number of people

or, 68= 58+58+x/3

or, 68 * 3= 58+58+x

or, 204=116+x

or, x= 204-116

or,x= 88

Therefore, the weight of third person was 88 kg

tia_tia [17]3 years ago

5 0

88kg I think the person weighs not sure hopefully this helps different country

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Wendy is standing 60 feet away from a tree. Her eyes are 5 feet above the ground. She sees a bird hovering above a tree. The ang

Gennadij [26K]

The bird is 17 feet above the tree.

<u>Explanation:</u>

We need to think of this in terms of right triangles. If Wendy is 60 feet from a tree, the base of the right triangle is 60 feet. The height of the tree is the height of the right triangle. The angle of elevation is the one from the ground at her feet to the top of the tree and then to the bird. Let's start with the top of the tree first.

She's 60 feet away, we have the angle of elevation as 25 degrees, and we are looking for the height of the tree. In regards to the angle, the base of 60 is adjacent, and the height of the tree is opposite. The tangent ratio is height / base.

Let x be the height of the tree.

So,

$tan (25) = \frac{x}{60}$

$60 tan(25) = x\\\\x = 27.9 feet$

x is approximately 28 feet

Since, Wendy's eyes are 5 feet above the ground, the height of the tree becomes

28 + 5 = 33 feet

<u>For bird</u>

Let y be the height of the bird in the air

$tan(37) = \frac{y}{60} \\\\60 tan(37) = y\\\\y = 45.2 feet$

y is approximately 45 feet

Since, Wendy's eyes are 5 feet above the ground, the height of the tree becomes

45 + 5 = 50 feet

To know how far above the tree that bird is

50 - 33 = 17 feet

Therefore, the bird is 17 feet above the tree.

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4 years ago

You want to have your carpet cleaned in your living room which measures 12’ by 14’. Company A charges $2.75 per square foot and

Sonja [21]

Answer: Company B

Step-by-step explanation:

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Company A charges, $462, while Company B will charge $450 for the one room.

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slava [35]

So to rewrite it so that we can find the side, we just need to isolate the a variable.

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3 years ago

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Mumz [18]

Answer:

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Triss [41]

Answer:

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(Except you get all the jellybeans because your friends don't exist)

Hope this helps :)

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