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Harrizon [31]
3 years ago
15

A building 82 ft high casts a 205-ft shadow. Sarah casts a 10-ft shadow. The triangle formed by the building and its shadow is s

imilar to the triangle formed by Sarah and her shadow. How tall is Sarah ?
Mathematics
2 answers:
Nataly [62]3 years ago
8 0

Answer:

Height of Sarah is 4 ft.

Step-by-step explanation:

A building 82 ft high casts a 205 ft shadow.

Sarah casts a 10 ft shadow.

The triangle formed by the building and its shadow is similar to the triangle formed by Sarah and her shadow.

Let height of Sarah be x.

Then,\dfrac{82}{205}=\dfrac{x}{10}\\\\x=\dfrac{820}{205}\\ \\x=4

Hence, height of Sarah is 4 ft.

madam [21]3 years ago
3 0
Divide 205 and 82.

HOPE I HELPED
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The lifetime of a certain type of battery is normally distributed with mean value 15 hours and standard deviation 1 hour. There
KIM [24]

Answer:

If the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 15

Standard Deviation, σ = 1

Sample size = 4

Total lifetime of 4 batteries = 40 hours

We are given that the distribution of lifetime is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

Standard error due to sampling:

\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{1}{\sqrt4} = 0.5

We have to find the value of x such that the probability is 0.05

P(X > x)  = 0.05

P( X > x) = P( z > \displaystyle\frac{x - 40}{0.5})=0.05  

= 1 -P( z \leq \displaystyle\frac{x - 40}{0.5})=0.05  

=P( z \leq \displaystyle\frac{x - 40}{0.5})=0.95  

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 40}{0.5} = 1.64\\x = 40.825 \approx 40.83  

Hence, if the lifetime of batteries in the packet is 40.83 hours or more then, it exceeds for 5% of all packages.

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3 years ago
Mr. Singh just left his house to go to work and has a meeting as soon as he arrives. The
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Step-by-step explanation:

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3 years ago
The perimeter of a square is 3/4 meters. What is the measure of its length in meters
telo118 [61]

Answer:The answer is 0.1875, or 3/16 (in fraction form)

Step-by-step explanation: 3/4 divided by 4, (a square is equal on all 4 sides)

And there you have it!!!

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Answer:

g(f(x))=(4x-1)^2+7=16\,x^2-8x+8

Step-by-step explanation:

Given:

f(x)=4x-1\\and \\g(x)=x^2+7

Then the composition of functions:

g(f(x))=g(4x-1)=(4x-1)^2+7= (16\,x^2-8x+1)+7=16\,x^2-8x+8

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