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gayaneshka [121]
1 year ago
11

Does someone mind helping me with this problem? Thank you!

Mathematics
2 answers:
RSB [31]1 year ago
7 0

\qquad\qquad\huge\underline{{\sf Answer}}

Let's calculate the value of c using Pythagoras theorem ~

\qquad \sf  \dashrightarrow \: c {}^{2}  = a {}^{2}  +  {b}^{2}

\qquad \sf  \dashrightarrow \: 40 {}^{2}  =  {24}^{2}  +  {b}^{2}

\qquad \sf  \dashrightarrow \: b² =  \sqrt{40² -  24²}

\qquad \sf  \dashrightarrow \: b=  \sqrt{1600-576}

{\qquad \sf  \dashrightarrow \: b= \sqrt{1024}}

\qquad \sf  \dashrightarrow \: b = 32 \: units

boyakko [2]1 year ago
7 0
<h3>Given:</h3>
  • hypotenuse= 40
  • side 1= 24
<h3>To find:</h3>

The length of "b"

<h3>Solution:</h3>

{c}^{2}  =  {a}^{2}  -  {b}^{2}

{b}^{2}  =  {40}^{2}  -  {24}^{2}

b = 1024

b =  \sqrt{1024}

b = 32

<u>Hence</u><u>,</u><u> </u><u>the</u><u> </u><u>length</u><u> </u><u>of</u><u> </u><u>"</u><u>b"</u><u> </u><u>is</u><u> </u><u>3</u><u>2</u><u>.</u>

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Ksju [112]

Answer:

a² = 144

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c = 13

Step-by-step explanation:

• a² = 12×12

= 144

• b² = 5×5

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6 0
2 years ago
One operator is holding a laser pointer at a height of 9 feet whose beam is reflected on a horizontal reflecting surface at a po
lutik1710 [3]

Answer:

The height (in feet) at which the laser will impact the wall is 6.75 feet

Step-by-step explanation:

The given parameters are;

The height from which the laser beam operator is holding the laser = 9 feet

The horizontal distance away from the pointer the beam is reflected = 8 feet

Given that we have;

f(x) = \dfrac{9}{8} \times \left | x - 8\right | = y

When x = 8, the point of reflection, the height, f(x) is given as follows;

f(x) = \dfrac{9}{8} \times \left | 8 - 8\right | = 0

When x = 7, the point of reflection, the height, f(x) is given as follows;

f(x) = \dfrac{9}{8} \times \left | 7 - 8\right | = \dfrac{9}{8}

Therefore, given that the point of reflection is at an elevation of 0 relative to the 9 feet of the laser source (pointer), by tan rule, we have;

tan(\theta) = \dfrac{Opposite \ side}{Adjacent \ side} =\dfrac{9}{8} = \dfrac{h}{7}

Where;

h = The height at which the laser meets the wall

h = \dfrac{9 \times  7}{8} =7.875

Given that the wall the laser meets is at the point x with elevation 9/8, the height, y, at which the laser meets the wall is therefore;

y = \dfrac{9 \times  7}{8} - \dfrac{9}{8} = \dfrac{54}{8} = 6.75 \ feet

The height (in feet) at which the laser will impact the wall = 6.75 feet.

7 0
3 years ago
A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were de
olga2289 [7]

Answer:

Se=1.2

Step-by-step explanation:

The standard error is the standard deviation of a sample population. "It measures the accuracy with which a sample represents a population".

The central limit theorem (CLT) states "that the distribution of sample means approximates a normal distribution, as the sample size becomes larger, assuming that all samples are identical in size, and regardless of the population distribution shape"

The sample mean is defined as:

\bar X =\frac{\sum_{i=1}^n x_i}{n}

And the distribution for the sample mean is given by:

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})

Let X denotes the random variable that measures the particular characteristic of interest. Let, X1, X2, …, Xn be the values of the random variable for the n units of the sample.

As the sample size is large,(>30) it can be assumed that the distribution is normal. The standard error of the sample mean X bar is given by:

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If we replace the values given we have:

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\bar X \sim N(\mu=80,Se=1.2)

5 0
2 years ago
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