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VikaD [51]
3 years ago
9

In ΔBCD, the measure of ∠D=90°, BD = 20, CB = 29, and DC = 21. What is the value of the cosine of ∠C to the nearest hundredth?

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
8 0

Step-by-step explanation:

This is what the triangle should look like, when you draw it.

As its a right-angle triangle, trigonometry was used.

Let theta represent the angle of cosine C

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Write the equation of the circle with center (5, 1) and radius r = 10
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The standard equation for the circle is:

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We are given that the center is (5,1) and r=10 so

(x-5)^2+(y-1)^2=100
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3 years ago
Use this system of equations to answer the questions
Over [174]

Answer:

1. To eliminate x-term, multiply the second by -2

2. To eliminate y-term, multiply the second by 3

Step-by-step explanation:

4x - 9y = 7 (1)

-2x + 3y = 4 (2)

1. To eliminate x-term, multiply the second by -2

-2x + 3y = 4 (2) × 2

-4x + 6y = 8 (3)

4x - 9y = 7 (1)

Add (3) and (1)

6y - 9y = 8 + 7

-3y = 15

y = 15/-3

y = -5

4x - 9y = 7 (1)

4x - 9(-5) = 7

4x + 45 = 7

4x = 7 - 45

4x = -38

x = -38/4

x = -9.5

4x - 9y = 7 (1)

-2x + 3y = 4 (2)

2. To eliminate y-term, multiply the second by 3

-2x + 3y = 4 (2) × 3

-6x + 9y = 12 (3)

4x - 9y = 7 (1)

-6x + 4x = 12 + 7

-2x = 19

x = 19/-2

x = -9.5

4x - 9y = 7 (1)

4(-9.5) - 9y = 7

-38 - 9y = 7

-38 - 7 = 9y

-45 = 9y

y = -45/9

y = -5

6 0
2 years ago
Read 2 more answers
The picture is my question.
Dominik [7]
The second one because domain refers to x, and since at (-3,-4) the point is hollow, the sign should be < without the line under it
5 0
3 years ago
Read 2 more answers
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