2 years ago

Pls help I need this done asap

Mathematics

1 answer:

Bezzdna [24]2 years ago

3 0

Would you like me to add them separately or should i add both answer together after?

Step-by-step explanation:

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Do we use Pythagorean theorem to find missing sides or missing angles in a right triangle

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To find missing lengths of sides
hope this helped have a nice day

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3 years ago

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VashaNatasha [74]

The numbers are going down

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Someone plz help me as soon as possible plzzz

Alborosie

Variable: a symbol for a number you don’t know yet
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3 years ago

How do you answer number 5

riadik2000 [5.3K]

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3 years ago

A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks along the x-axis from the spotlight toward the bui

Sedbober [7]

Answer:

0.675 m/s

Step-by-step explanation:

Let height of shadow= y,CD=x

Height of man=2 m

Speed of man= $\frac{dx}{dt}=1. 8 m/s$

$\triangle ABD\sim\triangle ECD$

Therefore, $\frac{AB}{EC}=\frac{BD}{CD}$

$\frac{y}{2}=\frac{12}{x}$

$xy=24$

Differentiate w.r.t t

$x\frac{dy}{dt}+y\frac{dx}{dt}=0$

$x\frac{dy}{dt}=-y\frac{dx}{dt}$

$\frac{dy}{dt}=-\frac{y}{x}\frac{dx}{dt}$

When the man is 4 m from the building

Then, we have x=12-4=8 m

$\frac{dx}{dt}=1.8 m/s$

Substitute the values in above equation then, we get

$8y=24$

$y=\frac{24}{8}=3$

Substitute the values then we get

$\frac{dy}{dt}=-\frac{3}{8}\times 1.8=-0.675 m/s$

Hence, the length of his shadow on the building decreasing at the rate 0.675 m/s.

8 0

3 years ago

Pls help I need this done asap​

Pls help I need this done asap