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Yakvenalex [24]
3 years ago
15

How many ways can first, second, and third place be awarded in a race of 20 people?

Mathematics
1 answer:
Volgvan3 years ago
3 0
That would be 20 x 19 x 18 which equals 6840. 
After first place is chosen, 19 spots left and so on.
The answer is 6840 ways.
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Yesterday, Ryan had 150 baseball cards. Today, he got d more. Using d , write an expression for the total number of baseball car
natali 33 [55]

Hey there!

Here is an expression for the number of cards Ryan may have.

150 + d = ?

Hope this helps!

4 0
3 years ago
USING SIMILAR TRIANGLES IN INDIRECT MEASUREMENT If the shadow of a tree is 14 m long and the shadow of a person who is 1.8 m tal
maw [93]

Answer:

14/1.8 = x/4

Step-by-step explanation:

Using similar triangles,

height of man/length of man's shadow = height of tree/length of tree's shadow

1.8/4 = x/14

x/14 = 1.8/4

If we cross-multiply, we have

1.8 × 14 = x × 4

dividing both sides by 4 and 1.8,we have

14/4 = x/1.8

x/1.8 = 14/4

So, the two expressions we have are

x/14 = 1.8/4 and x/1.8 = 14/4.

So, the answer is 14/1.8 = x/4 since the product 1.8 × 14 = x × 4 cannot be expressed in the given ratio.

4 0
3 years ago
What is the answer to Justin is 2 years older than one third Marcella's age?
stira [4]
Does it say Marcella's age?
3 0
3 years ago
At the beginning of an environmental study, a forest covered an area of 1500km^2. Since then, the area has decreased by 6.3% eac
geniusboy [140]

The <em><u>correct answer</u></em> is:

y=1500(0.937)^t

Explanation:

An exponential function is of the form

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For our problem, a, the initial population, is 1500.

The yearly change is 6.3%; 6.3% = 6.3/100 = 0.063.  Since it is decreasing, this is negative; 1+(-0.063) = 0.937.

We use t as the number of years.

This gives us

y=1500(0.937)^t

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3 years ago
Which expression is equivalent to 4/9x7?
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Is there an answer key?

8 0
2 years ago
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