3 years ago

#12 please I don't if anyone knows the GUESS method, that would be great

Mathematics

1 answer:

pochemuha3 years ago

4 0

An hour and five minutes

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A staircase has an angle of elevation of 28° anı

AveGali [126]

Hi there!

We can use right-triangle trigonometry to solve.

We are given the HYPOTENUSE and ADJACENT sides, so we must use cosine in this instance.

cosθ = Adjacent/Hypotenuse

We can plug in what is given:

cos(28) = A/17

Solve for 'A':

17cos(28) = <u>15.01 ft</u>

5 0

2 years ago

A scientist wishes to estimate the mean breaking strength of a certain type of steel rod within 3.0 psi with 95% confidence. Bas

yaroslaw [1]

Answer:97 rods

Step-by-step explanation:

The number of steel rods for 95% confidence level

$n=\left ( \frac{Z_\frac{\alpha }{2}\times \hat{\sigma }}{E} \right )^2$

$Z_\frac{\alpha }{2}=1.96$

E=3

$\hat{\sigma }=15$

Substituting values

$n=\left ( \frac{1.96\times 15}{3}\right )^2$

$n=96.04\approx 97$

Thus 97 rods is tested

6 0

3 years ago

What is the age of each of these people.

NikAS [45]

You can do it if you believe in your self!

8 0

3 years ago

Solve for x in the figure below. Write your answer in simplest radical form. X = ____

Gnesinka [82]

A^2+b^2=c^2
7^2+11^2=?
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x= Square root of 170

Hope this helps!! :)

7 0

2 years ago

Please solve 2x+3=x−4

ddd [48]

The answer is x = -7

4 0

3 years ago

Read 2 more answers