2 years ago

NEED HELP PLEASEEE!!!!

Mathematics

1 answer:

baherus [9]2 years ago

8 0

In my opinion, the answer is 14 m

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The intensity of a light source at a distance is directly proportional to the strength of the source and inversely proportional

jolli1 [7]

Answer:

x= $\frac{16}{\sqrt[3]{2}+1 }$

Step-by-step explanation:

Q= illumination

I = intensity

Q= I/d^2

Q_total = $\frac{I_1}{d_1^2}+\frac{I_2}{d_2^2}$

= $\frac{I}{x^2}+\frac{2I}{(16-x)^2}$

now Q' = 0

⇒I ${-\frac{2}{x^3}}+\frac{4}{(16-x)^3}$

x= $\frac{16}{\sqrt[3]{2}+1 }$

[/tex] $\frac{1}{x^3} = \frac{2}{(16-x)^3}$

x= $\frac{16}{\sqrt[3]{2}+1 }$

is the required point

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2 years ago

Michael ran 3 miles in 24 minutes. What is his average running speed in miles per hour?

givi [52]

Answer:

7.5 miles / hour

Step-by-step explanation:

See the step-by-step solution in the picture attached below.

I hope this answer will help you. Have a nice day !

7 0

3 years ago

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Fine the area of a circle with a radius of 7 in. Write the formula, substitute, solve.

bija089 [108]

Formula: A=(pi)r^2

Substitution: A=3.14(7^2)

A=3.14(49)

Solve: A=153.86 in^2

*I personally like to use the pi sign on my calculator to multiply the radius squared by, but my keyboard did not have a pi sign. Usually, the pi sign is more exact. If you used the pi sign, your answer would be 153.94 inches^2. Hope this helps!

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2 years ago

Volume of a cylinder with radius r and height h is

Airida [17]

Answer:

$h = \frac{v}{\pi r^{2} }$

Step-by-step explanation:

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2 years ago

Please help 4 b + 13 equals 57

sweet [91]

B = 11
(my handwriting is so bad excuse me )

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3 years ago