Use the rules of significant figures to find the answer to the addition problem S= 25.4+14+16.67+3.903

1 answer:

6 0

S=59.973 all you have to do now is round it. So the real answer is S=60. All i did was add up all the numbers.
$25.4 + 16.67 = 42.07 + 3.903 = 45.973 + 14 = 59.973$

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sergiy2304 [10]

Answer: the standard deviation is 2.4

Step-by-step explanation:

The formula for standard deviation is expressed as

s = √npq

Where

p = probability of success

q = probability of failure

n = number of samples

From the information given,

The probability of success, p is given as 0.2. It means that the probability of failure, q will be 1 - p = 1 - 0.2 = 0.8

There were 35 attempts. This means that total number of samples, n is 35

The standard deviation becomes

√35×0.2×0.8 = √5.6 = 2.366

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3 years ago

to estimate the height of the jin mao tower in shanghai , a tourist sights the top of the tower form a mirror that is 86.7 meter

Ray Of Light [21]

Answer:

The height of the tower = 420.48 meters

Step-by-step explanation:

For better understanding of the solution, see the figure attached below :

Let the height of the tower be x meters

Now, using the laws of reflection : angle of reflection = angle of incidence

Also, both the tower and the tourist are standing parallel to each other

⇒ ∠A = ∠i ( Alternate interior angles are equal)

Similarly, ∠D = ∠r ( Alternate interior angles)

But, ∠i = ∠r

⇒ ∠A = ∠D

Also, the tourist and the tower is perpendicular to the ground surface.

⇒ m∠B = m∠E = 90°

Now, in ΔABC and ΔDEC

∠A = ∠D (Proved above)

m∠B = m∠E = 90°

So, by AA postulate of similarity of triangles, ΔABC ~ ΔDEC

As the sides of similar triangles are proportional to each other

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