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2 years ago

Can someone help me with this. Will Mark brainliest. Need answer and explanations/work. Thank you.

Mathematics

1 answer:

hoa [83]2 years ago

3 0

Answer:

cosine of angle a = 8/17

Step-by-step explanation:

Hello there!

Remember these are the trigonometric ratios

SOC CAH TOA

Sine = Opposite over Hypotenuse (SOH)

Cosine = Adjacent over Hypotenuse (CAH)

Tangent = Opposite over Adjacent (TOA)

And we are asked to find the Cosine of angle A

Remember cosine is adjacent over hypotenuse

Hypotenuse - The longest side

Adjacent - the side that's not the hypotenuse nor the opposite

The adjacent side length of angle A is equal to 8 and the hypotenuse is equal to 17

so the cosine of angle a = 8/17

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36 hundredths divided 9 tenths

valentina_108 [34]

Answer: 0.4

Step-by-step explanation:

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2 years ago

What is 10b +19 when b= -2

otez555 [7]

Answer:

-1 i hope this helps! :)

Step-by-step explanation:

you are given both 10b + 19 and b = -2

lets plug in the value of b

10b(-2) + 19

multiply the 10b and the -2

-20b + 19

-20 + 19 = -1

-1

4 0

3 years ago

A bag has 6 red marbles, 8 blue marbles and 4 yellow marbles. What is the probability of picking a red marble, replacing it, and

ValentinkaMS [17]

Answer:

4/27

Step-by-step explanation:

6 red marbles, 8 blue marbles and 4 yellow marbles.= 18 total marbles

P(red marble) = number red marbles / total

=6/18 = 1/3

We put the marble back

6 red marbles, 8 blue marbles and 4 yellow marbles.= 18 total marbles

P(blue marble) = number blue marbles / total

=8/18 = 4/9

P(red, replace. blue) = P(red) * P (blue)

= 1/3 * 4/9 = 4/27

7 0

3 years ago

Read 2 more answers

The accompanying frequency distribution represents the square footage of a random sample of 500 houses that are owner occupied y

ioda

Answer:

$\bar X = \frac{\sum x_i f_i}{n} = \frac{1220750}{500}=2441.5$

$s^2= \frac{3408029125 -\frac{(1220750)^2}{500}}{500-1} =856849.7$

$s= \sqrt{856849.7}=925.662$

Step-by-step explanation:

For this case we can create the following table

Interval Frequency (f) Midpoint(xi) xi *f xi^2* f

0-499 9 249.5 2245.5 560252.3

500-999 13 749.5 9743.5 7302753

1000-1499 33 1249.5 41233.5 51521258.25

1500-1999 115 1749.5 201193.5 361986278.8

2000-2499 125 2249.5 281187.5 632531281.3

2500-2999 81 2749.5 222709.5 612339770.3

3000-3499 47 3249.5 152726.5 496284761.8

3500-3999 45 3749.5 168727.5 632643761.3

4000-4499 22 4249.5 93489 397281505.5

4500-4999 10 4749.5 47495 225577502.5

Total 500 1220750 3408029125

$\sum f_i = 500 , \sum x_i f_i = 1220750, \sum x^2_i f_i = 3408029125$

For this case we can calculate the sample mean with this formula:

$\bar X = \frac{\sum x_i f_i}{n} = \frac{1220750}{500}=2441.5$

And for the sample variance we can use the following formula:

$s^2= \frac{\sum x^2_i f_i - \frac{(\sum x_i f_i)^2}{n}}{n-1}$

And if we replace we got:

$s^2= \frac{3408029125 -\frac{(1220750)^2}{500}}{500-1} =856849.7$

And the deviation is just the square root of the sample variance and for this case is:

$s= \sqrt{856849.7}=925.662$

4 0

2 years ago

4x-5y=-45 <br> in slope intercept form

kkurt [141]

Answer:

y=4/5x+9

Step-by-step explanation:

-5y=-4x-45

y=4/5x+9

5 0

2 years ago