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3 years ago

Lily ran 100 meters in 15 seconds. How long did she take to run 2 meters

Mathematics

2 answers:

denis23 [38]3 years ago

7 0

.15 seconds because I said

postnew [5]3 years ago

7 0

If Lily runs 100 meters in 15 seconds, then she runs 1 meter in 0.15 seconds. (Just dividing 15 by 100)

If she runs 1 meter in 0.15 seconds, then she’ll run 2 meters in 0.3 seconds (0.15 + 0.15)

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In a right triangle ABC, CD is an altitude, such that AD=BC. Find AC, if AB=3 cm, and CD= root 2 cm.

Nata [24]

Given CD is an altitude such that AD=BC , AB=3 cm and CD= √2 cm.

Let AD=x, Since given AB=3

AD+DB=3

x+DB = 3

DB = 3-x

Since ΔBCD is rght angle triangle, let's apply Pythagoras theorem

$BC^{2} = DB^{2} +CD^{2}$

$BC^{2} = (3-x)^{2} +(\sqrt{2} )^{2}$

$BC^{2} =(3-x)^{2} +2$

Since given AD=BC,let us plugin BC=x in above step.

$x^{2} =(3-x)^{2} +2$

$x^{2} =9-6x+x^{2} +2$

6x=11

x= $\frac{11}{6}$

Now we know AD=x= $\frac{11}{6}$ and given CD=√2.

Let us apply Pythagoras theorem for ΔACD

$AC^{2} =AD^{2} +DC^{2}$

$AC^{2} = (\frac{11}{6} )^{2} +(\sqrt{2} )^{2}$

$AC^{2} =\frac{193}{36}$

$AC=\sqrt{\frac{193}{36} }$ = 2.315cm

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Irina18 [472]

Answer:

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Step-by-step explanation:

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hope that helps

------------------------------------</span>

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