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2 years ago

Help plz with this question. Needed fast. I will mark brainliest.

Mathematics

2 answers:

vodomira [7]2 years ago

7 0

Answer:

≈ 68.2°

Step-by-step explanation:

tan X= 20/8

tan X= 2.5

x= tan ⁻¹ 2.5

x ≈ 68.2°

choli [55]2 years ago

3 0

Answer:

Step-by-step explanation:

To find the size of YXZ we should use some trigonometry but first let's find the length of YZ

The Pythagorian theorem :

(XZ)²+(ZY)²=(YX)²

YX= $\sqrt{20^{2}+8^{2} }$

=4 $\sqrt{29}$

using a calculator we get (YXZ)= 68°

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A sample of 5 strings of thread is randomly selected and the following thicknesses are measured in millimeters. Give a point est

liq [111]

Answer:

$s^2 = \frac{(1.48-1.502)^2 +(1.45-1.502)^2 +(1.54-1.502)^2 +(1.52-1.502)^2 +(1.52-1.502)^2}{5-1} =0.00132$

And for the deviation we have:

$s= \sqrt{0.00132}=0.0363$

And that value represent the best estimator for the population deviation since:

$E(s) =\sigma$

Step-by-step explanation:

For this case we have the following data:

1.48,1.45,1.54,1.52,1.52

The first step for this cae is find the sample mean with the following formula:

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

And replacing we got:

$\bar X= \frac{1.48+1.45+1.54+1.52+1.52}{5} = 1.502$

And now we can calculate the sample variance with the following formula:

$s^2 =\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

And replacing we got:

$s^2 = \frac{(1.48-1.502)^2 +(1.45-1.502)^2 +(1.54-1.502)^2 +(1.52-1.502)^2 +(1.52-1.502)^2}{5-1} =0.00132$

And for the deviation we have:

$s= \sqrt{0.00132}=0.0363$

And that value represent the best estimator for the population deviation since:

$E(s) =\sigma$

4 0

2 years ago

Read 2 more answers

Solve the equation 8x-7=y-2 for x if y is 51. make sure to first solve for in terms y. x=?

Crank

X=7. if you need explanation message me

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2 years ago

A 10ft by 10ft square garden contains a large walking path through the diagonal. What is the area of the walking path shown in t

SpyIntel [72]

64fts^2 is the answer

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2 years ago

What is 258/300 as a percent

Step2247 [10]

To transform it into percent we want to have 100 into denominator. The easiest way is divide numerator and denominator by 3 (thats because than it doesnt change the value of fraction), so:
$\frac{258}{300}= \frac{258:3}{300:3}= \frac{86}{100} = 86%$ - its the result

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3 years ago

Read 2 more answers

AC = <br> Round your answer to the nearest hundredth.

dusya [7]

Answer:

AC ≈ 5.03

Step-by-step explanation:

We can solve the problem above using the trigonometric ratio, they are;

SOH CAH TOA

sin Ф = opposite / hypotenuse

cosФ= adjacent/ hypotenuse

tan Ф = opposite / adjacent

From the diagram above, in reference to angle B;

opposite =AC and adjacent =BC

Since we have opposite and adjacent, the best formula to use is

tanФ = opposite / adjacent

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tan 40 = AC/ 6

Multiply both-side of the equation by 6

6× tan 40 = AC/ 6 × 6

At the right-hand side of the equation, 6 will cancel-out 6 leaving us with just AC

6×tan 40 = AC

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AC ≈ 5.03 to the nearest hundredths

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2 years ago