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3 years ago

Raul used this method to find the sum of 427+316.

Mathematics

2 answers:

Serga [27]3 years ago

7 0

427+316 will equal 743 and to check your work you can subtract

Natalka [10]3 years ago

3 0

It is like
427+316=743

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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.

8 0

2 years ago

a local sports team sells 6 tickets for $3,8 tickets for $4,and 10 tickets for $5.write a rule and equation to find out the cost

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2 years ago

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mezya [45]

You must add up all of the values and then divide them by the number of the values.

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3 years ago

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Dafna1 [17]

Answer:

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Step-by-step explanation:

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I like to line them up vertically

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-----------------------------------

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2 years ago

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4/49 times 7/13 thank you

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Answer:

0.04395604395

Step-by-step explanation:

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3 years ago

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