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Damm [24]
3 years ago
11

the height of a tree was 12 feet. after a year, the tree's height increased 25%. what is the height of the tree after a year

Mathematics
1 answer:
Margaret [11]3 years ago
7 0

Answer:

15 feet

Step-by-step explanation:

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If Y is inversely proportional to x and y=4 when x= 100, what is the value of y when x=250
hichkok12 [17]

Answer:

y=10

Step-by-step explanation:

\frac{4}{100}=\frac{y}{250}

cross-multiply, 4*250=100y

isolate the variable and solve for y, 1000=100y

divide 100 on both sides, 10=y

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Reil [10]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
Two airplanes are flying in the air at the same height: airplane A is flying east at 250 mi/h and airplane B is flying north at
just olya [345]

Answer:

  decreasing at 390 miles per hour

Step-by-step explanation:

Airplane A's distance in miles to the airport can be written as ...

  a = 30 -250t . . . . . where t is in hours

Likewise, airplane B's distance to the airport can be written as ...

  b = 40 -300t

The distance (d) between the airplanes can be found using the Pythagorean theorem:

  d^2 = a^2 + b^2

Differentiating with respect to time, we have ...

  2d·d' = 2a·a' +2b·b'

  d' = (a·a' +b·b')/d

__

To find a numerical value of this, we need to find the values of its variables at t=0.

  a = 30 -250·0 = 30

  a' = -250

  b = 40 -300·0 = 40

  b' = -300

  d = √(a²+b²) = √(900+1600) = 50

Then ...

  d' = (30(-250) +40(-300))/50 = -19500/50 = -390

The distance between the airplanes is decreasing at 390 miles per hour.

3 0
3 years ago
A machine produces 268 bolts in 28 minutes. At the same rate, how many bolts would be produced in 21 minutes?
iren2701 [21]
268 / 28 = 9.57

9.57 x 21 = 201

Therefore, the answer is 201.
8 0
3 years ago
Read 2 more answers
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