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QveST [7]
2 years ago
15

the relationship between money earned and hours worked is linear. joe computes the slope between (4, 30) and (12, 90), then comp

utes the slope between (4, 30) and (10, 75). how do the two slopes compare?
Mathematics
2 answers:
julia-pushkina [17]2 years ago
6 0
Slope = rise/run =[y2-y1]/[x2-x1]

1) slope = [90 - 30] / [12 - 4] = 60 / 8 = 15/2

2) slope = [75 - 30] / [10 - 4] = 45 / 6 = 15 / 2

The slopps are equal.
mylen [45]2 years ago
3 0

Answer: The slopes are equal.

The points are representing the same line.

Step-by-step explanation:

We know that the slope between points (a,b) and (c,d) is given by :-

m=\dfrac{d-b}{c-a}

The slope between the points (4,30)  and (12,90) will be

m_1=\dfrac{90-30}{12-4}=\dfrac{60}{8}=\dfrac{15}{2}

The slope between the points (4,30) and (10,75) will be

m_2=\dfrac{75-30}{10-4}=\dfrac{45}{6}=\dfrac{15}{2}

\Rightarrow\ m_1=m_2

We know that if the slopes are equal then the lines are parallel.

But they have one point common (4,30) so it cannot be parallel, they ust be same line .

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A. The approximate height of the building is 100 m

B. We can use the arc length formula to obtain an approximation of BC since angle A is small.

A.

The approximate height of the building is 100 m

To find the approximate height of the building, we consider the diagram.

From the diagram, we have that using trigonometry,

tanA = BC/AB

Now

  • A = 0.05 radians,
  • BC = height of building and
  • AB = 2 km = 2000 m
<h3 /><h3>Finding the value of BC</h3>

So, making BC subject of the formua, we have

BC = ABtanA

Substituting the values of the variables into the equation, we have

BC = ABtanA

BC =2000tan0.05

BC = 2000 × 0.05

BC = 100 m

So, the approximate height of the building is 100 m

B.

We can use the arc length formula to obtain an approximation of BC since angle A is small.

<h3 /><h3>Arc Length Formula</h3>

We know that the arc length formula L = rФ where

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Now BC = ABtanA

We know that Ф ≅ tanФ when Ф is small.

<h3 /><h3>The comparison</h3>

So, BC = AB × A which is the arc length formula with

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So, we can use the arc length formula to obtain an approximation of BC since angle A is small.

Learn more about approximate height of building here:

brainly.com/question/3144976

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