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3 years ago

What percent of 500 is 255?

Mathematics

2 answers:

Sidana [21]3 years ago

5 0

255 is what percent of 500? = 51.

Elena-2011 [213]3 years ago

3 0

Answer:

Step-by-step explanation:

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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.

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3 years ago

Please help me fast<br><br>see this pic and tell what was in pic write in 30-40 words

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The picture shows three kids playing with a ball Two more kids getting ice cream from a vendor stopped by the road and three more kids eating there ice cream with tall buildings in the back

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2 years ago

20 1/4% of 3 What is the answer?

kompoz [17]

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$\frac{1}{4} \times 100 = 25 \: \: percent \\$

$\frac{25}{100} \times 3 = \frac{75}{100} = 0.75 \\$

Thus :

1 / 4 % of 3 is 0.75 .

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3 years ago

Complete the pattern 4,15,7,12,10,9 ? ? ? show me how you got your work

kkurt [141]

Given the pattern:
4,15,7,12,10,9,..
Every other term after the first term is increasing by 3. Thus continuing the pattern we shall have:
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thus the missing numbers will be:
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