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2 years ago

In angle ABC, AB = 2.5 m, BC = 3.2 m and AC = 2.9 m. Use the Cosine Law to find

Mathematics

1 answer:

Triss [41]2 years ago

3 0

9514 1404 393

Answer:

∠A ≈ 72°

Step-by-step explanation:

Fill in the given numbers and do the arithmetic.

cos A = (2.9² +2.5² -3.2²)/(2(2.9)(2.5)) = 4.42/14.5

The inverse cosine function is used to find the angle, given its cosine.

A = arccos(4.42/14.5)

∠A ≈ 72°

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GIVING 100 POINTS FOR THESE 3 PROBLEMS

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Answer:

Step-by-step explanation:

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$A=wl=6*5=30in^2$

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2 years ago

Read 2 more answers

Find the area. Simplify your answer.

Colt1911 [192]

Answer:

x = 26

Step-by-step explanation:

it is a right angle so

(x+4)3=90

3x+12=90

-12 -12

3x = 90-12

3x = 78

/3 /3

x = 26

7 0

3 years ago

Which is the constant term of the algebraic expression -2x^2+17-15x+7xy?

andrew11 [14]

The given expression is
-2x² + 17 - 15x + 7xy

The algebraic expression may be written as
-2x² + 7xy - 15x + 17

The constant term does not contain either x or y.
Therefore 17 is the constant term.

Answer: 17

7 0

2 years ago

Circle 1 has a diameter of 18 and circle 2 has a diameter of 20.

borishaifa [10]

Answer:

D. 59.66

Step-by-step explanation:

The formula is <em>A = $\pi r^{2}[/tex\ Also the radius is half of the diameter. and [tex]\pi$ = 3.14</em>

so we need to find the area's

9 x 9 = 81

81 x 3.14 = 254.34

Next circle.

10 x 10 = 100

100 x 3.14 = 314

Now to find the difference.

314 - 254.34 = 59.66

59.66

Hope this helped! Please mark as brainliest! Thanks!

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3 years ago

What are the real solutions of the equation x^4= 81?

zmey [24]

Use photomath it’s free

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3 years ago