A cheetah ran 704 feet in 8 seconds, and then another 328 feet in 4 seconds.
What was the cheetah's average speed?
A.
84 ft/s
B.
86 ft/s
C.
85 ft/s
D.
94 ft/s
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OpenStudy (anonymous):
@Zackinblack
OpenStudy (afrodiddle):
divide 328 by 4 and tell me what you get
OpenStudy (anonymous):
82
OpenStudy (afrodiddle):
do the same with 704 divided by 8
OpenStudy (anonymous):
88
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OpenStudy (afrodiddle):
Do you know how to find average?
OpenStudy (afrodiddle):
To find the basic average, of a group of numbers, all you have to do is add them all up and divide the result by the amount of numbers in the set
OpenStudy (afrodiddle):
for example... let say you have the number 1,2,3,4
OpenStudy (afrodiddle):
you would have to add them up
1+2+3+4 = 10
OpenStudy (afrodiddle):
and because we had to add up 4 numbers, we have to divide 10 by 4.
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OpenStudy (anonymous):
I'm confused
OpenStudy (afrodiddle):
Which means the average between the number 1,2,3,4 is 2.5
OpenStudy (afrodiddle):
here, ill give you a set of numbers : 50,28,19,11
OpenStudy (afrodiddle):
add them all up.
OpenStudy (anonymous):
108
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OpenStudy (afrodiddle):
great now how many sets of numbers did we have?
OpenStudy (anonymous):
4
OpenStudy (afrodiddle):
so divide 108 by 4 and you get the average between those numbers
OpenStudy (anonymous):
27
OpenStudy (afrodiddle):
great, do you know how to find average now?
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OpenStudy (anonymous):
ya 25
OpenStudy (afrodiddle):
25? o.o
OpenStudy (anonymous):
27 to 25 rounded
OpenStudy (afrodiddle):
lets do your math problem now.
OpenStudy (anonymous):
okay
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OpenStudy (afrodiddle):
what are your set of numbers? ( the ones I made you find earlier)
OpenStudy (anonymous):
704, 8, 328, 4
OpenStudy (afrodiddle):
nope.
OpenStudy (afrodiddle):
when I made you divide.
OpenStudy (afrodiddle):
do you remember ?
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OpenStudy (anonymous):
108, 27, 4
OpenStudy (afrodiddle):
nope, we are doing your math problem
OpenStudy (afrodiddle):
we are finding the average feet/ per second
OpenStudy (afrodiddle):
which means we have to take the 704 feet and divide it by the 8 seconds
OpenStudy (anonymous):
I don't remember
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OpenStudy (afrodiddle):
it's the numbers you gave me 704,8,328,4
you were on the right track, but remember when we divided 704 by 8 and 328 by 4?
OpenStudy (afrodiddle):
the two numbers you get from dividing is your set of numbers
OpenStudy (anonymous):
I'm confused
OpenStudy (afrodiddle):
A cheetah ran 704 feet in 8 seconds, and then another 328 feet in 4 seconds.
OpenStudy (anonymous):
ya
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OpenStudy (afrodiddle):
right now, the feet and seconds are scattered
OpenStudy (afrodiddle):
we need to know how much the cheetah ran in 1 second
OpenStudy (anonymous):
okay
OpenStudy (afrodiddle):
so divide 704 by 8
OpenStudy (afrodiddle):
and 328 by 4
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OpenStudy (anonymous):
88
82
OpenStudy (afrodiddle):
great!
that's your set of numbers, do you remember what we do next?
OpenStudy (anonymous):
no
OpenStudy (afrodiddle):
we add them together
OpenStudy (afrodiddle):
88+82
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OpenStudy (anonymous):
170
OpenStudy (afrodiddle):
how many set of numbers did we have?
OpenStudy (anonymous):
2
OpenStudy (afrodiddle):
so divide 170 by 2 and that's your average ft/s
OpenStudy (anonymous):
85
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OpenStudy (afrodiddle):
yup, that's your answer! :)
OpenStudy (anonymous):
thanks
OpenStudy (anonymous):
do I get a medal
OpenStudy (afrodiddle):
No problem!
OpenStudy (anonymous):
?
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