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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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Which of the following numbers is irrational? negative 9 over 5, square root of 5, 7 over 3, square root of 9
nydimaria [60]

That would be the square root of five.

4 0
3 years ago
How many solutions does 5x^2+2=4x have
LenaWriter [7]

This has exactly two solutions.

You can find the number of a solutions that a problem has by its highest power of x. Since x is raised to the 2nd power in here, it has two solutions. In some cases, these solutions will be irrational, double roots, or non-real, but there will still be two of them regardless.

8 0
3 years ago
What is the value of x in the equation 8x-48 when y=4
Dominik [7]
Your equation is in the form

y = mx + b

4 = 8x - 48

Can you solve for x now?

7 0
3 years ago
How many whale sharks would a researcher need to measure so that 90% confidence level would have a margin of error of 0.25
Vika [28.1K]

About 1407 sharks would be needed to have a margin of error of 0.25

<h3>What is margin of error?</h3>

Margin of error is used to determine by what value there is deviation from the real value. Margin of error (E) is given by:

E=Z_\frac{\alpha}{2} *\frac{standard\ deviation}{\sqrt{sample\ size} }

The 90% confidence level have a z score of 1.645. Hence for E = 0.25, standard deviation = 5.7 feet, hence:

0.25=1.645*\frac{5.7}{\sqrt{sample\ size}}\\ \\sample\ size=1407

About 1407 sharks would be needed to have a margin of error of 0.25

Find out more on margin of error at: brainly.com/question/10218601

8 0
2 years ago
Samuel and Sebastian go to the movie theater and purchase refreshments for their friends.
Andreyy89

Answer and Step-by-step explanation:

samuel---> 1pc+3dr=36.75

sebastian--->3pc+12dr=138

1pc+4dr=46

1pc+4dr=46

1pc+3dr=36.75

so 1 dr=46-36.75=$9.25

4dr is 9.25×4=37

so 1 pc=46-37=$9.00

5 0
4 years ago
Read 2 more answers
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