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3 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]3 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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Gala2k [10]

Answer:

Geoff is 16.77 m far from base of tower.

Step-by-step explanation:

steps are in the picture below.

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3 years ago

The ages of the student volunteers at an event are 13, 11, 12, 15, 16, 11, 12,

aliya0001 [1]

Answer:The mean is 13

Step-by-step explanation:

Add all up and divide by 10 because there are 10 numbers

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3 years ago

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4, 5, 3, 3, 1, 2, 3, 2, 4, 8, 2, 4, 4, 5, 2, 3, 6,2

Anna007 [38]

Answer:

Given data:

4, 5, 3, 3, 1, 2, 3, 2, 4, 8, 2, 4, 4, 5, 2, 3, 6,2

Put the data in the ascending order:

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Mean, the average:

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Median, average of middle two numbers:

Mode, the most repeated number:

2 (repeated 5 times)

Mean is normally the best measure of central tendency, same applies to this data.

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3 years ago

Read 2 more answers

PLEASEEEE ANSWER ASAP

Alona [7]

Answer:

x = -1, x = 1

Step-by-step explanation:

Factor the equation. (It's a difference of squares, so we know the form will be (a-b)(a+b).)

$y = x^{2} - 1\\y = (x-1)(x+1)$

Test this by FOILing it out, if you're unsure. This is something it can be good to memorize!

Set it equal to 0.

$0 = (x+1)(x-1)$

Separate the two parenthetical expressions by the Zero Product Property.

$0 = x+1\\0 = x-1$

Solve for x!

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3 years ago

What is the x-intercept of y=5x+20?

densk [106]

Answer:

the x intercept is -4

Step-by-step explanation:

to find the x intercept, set y = 0 and solve for x

y = 5x+20

0 = 5x+20

subtract 20 from each side

-20 = 5x +20 -20

-20 = 5x

divide each side by 5

-20/5 = 5x/5

-4 =x

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3 years ago