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AnnZ [28]
3 years ago
5

2. A forester is-trying to determine the number of long leaf pine trees in a forest that covers 83 acres. She marks off three ha

lf-acre plots at randomly selected locations in the forest. The first plot contains 212 mature trees, the second plot contains 242 mature trees, and the third plot contains 236 mature trees. Use this data to estimate the number of mature long leaf pines in the entire forest. Explain your reasoning and show all of your work. ​
Mathematics
1 answer:
Margaret [11]3 years ago
3 0

Answer:

114540 mature long leaf pines

Step-by-step explanation:

Given that the matured long leaf pine trees in a forest that covers 83 acres. 

1 acre = 6 plot

83 acres = 83 × 6 = 498 plots

Among the three and half samples, he actually made use of 3 plots. So,

The first plot contains 212 mature trees, the second plot contains 242 mature trees, and the third plot contains 236 mature trees. That is 3 plots contain

3 plot = 212 +242 + 236 = 690 trees

The number of mature long leaf pines in the entire forest can be estimated as

= 498/3 × 690

= 166 × 690

= 114540 mature long leaf pines in the entire forest. 

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Find the coordinates of the center of the given circle
Yuliya22 [10]

Center of given circle is (h,k)= (5,-3)

Option A is correct.

Step-by-step explanation:

We need to find the coordinates of the center of the given circle: (x - 5)^2 + (y + 3)^2 = 25

The standard equation of circle is:

(x-h)^2+(y-k)^2=r^2

Where (h,k) is the center of circle and r is the radius of circle.

Now comparing the given equation with standard equation to find h and k

(x - 5)^2 + (y + 3)^2 = 25

Making it equivalent to standard equation:

(x -(5))^2 + (y-(-3))^2 = 25

By comparing, the value of h is 5 and k is -3

Hence center of given circle is (h,k)= (5,-3)

Option A is correct.

Keywords: Center of circle

Learn more about Center of circle at:

  • brainly.com/question/3333996
  • brainly.com/question/9510228
  • brainly.com/question/10610299

#learnwithBrainly

7 0
4 years ago
4
VLD [36.1K]
Answer is D. 81

1/4 x 4 = 1

81^1 = 81
4 0
3 years ago
The radius of the base of a cylinder is increasing at a rate of 7 millimeters per hour. The height of the cylinder is fixed at 1
Ilya [14]

Answer:

The rate of change of the volume of the cylinder at that instant = 791.28\ mm^3/hr

Step-by-step explanation:

Given:

Rate of increase of base of radius of base of cylinder = 7 mm/hr

Height of cylinder = 1.5 mm

Radius at a certain instant = 12 mm

To find rate of change of volume of cylinder at that instant.

Solution:

Let r represent radius of base of cylinder at any instant.

Rate of increase of base of radius of base of cylinder can be given as:

\frac{dr}{dt}=7\ mm/hr

Volume of cylinder is given by:

V=\pi\ r^2h

Finding derivative of the Volume with respect to time.

\frac{dV}{dt}=\pi\ h\ 2r\frac{dr}{dt}

Plugging in the values given:

\frac{dV}{dt}=\pi\ (1.5)\ 2(12)(7)

\frac{dV}{dt}=252\pi

Using \pi=3.14

\frac{dV}{dt}=252(3.14)

\frac{dV}{dt}=791.28\ mm^3/hr (Answer)

Thus rate of change of the volume of the cylinder at that instant = 791.28\ mm^3/hr

6 0
3 years ago
The table below gives the completion percentage and interception percentage for five randomly selected NFL quarterbacks. Based o
Lina20 [59]

The regression equation is y = -0.42647x + 29.11471 and the correlation coefficient is -0.9607

<h3>How to determine the regression equation?</h3>

The table of values is given as:

Completion Percentage 57 59 62 63 64

Interception Percentage 5 3.5 3 2.5 1.5

Next, we enter the above values in a graphing calculator.

From the graphing calculator, we have the following summary:

  • Sum of X = 305
  • Sum of Y = 15.5
  • Mean X = 61
  • Mean Y = 3.1
  • Sum of squares (SSX) = 34
  • Sum of products (SP) = -14.5
  • r = -0.9607

Regression Equation = ŷ = bX + a

b = SP/SSX = -14.5/34 = -0.42647

a = MY - bMX = 3.1 - (-0.43*61) = 29.11471

So, the regression equation is

y = -0.42647x + 29.11471

And the correlation coefficient is -0.9607

Read more about regression at:

brainly.com/question/14313391

#SPJ1

7 0
2 years ago
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Drupady [299]

Answer:

either a or c no problem nskskdjdjd

3 0
3 years ago
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