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Mathematics 19 Online
OpenStudy (anonymous):

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

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

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.

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

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?

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

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 ?

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

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

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

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

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

OpenStudy (afrodiddle):

yup, that's your answer! :)

OpenStudy (anonymous):

thanks

OpenStudy (anonymous):

do I get a medal

OpenStudy (afrodiddle):

No problem!

OpenStudy (anonymous):

?

OpenStudy (afrodiddle):

I'll give medal if you give one back :)

OpenStudy (anonymous):

I gave you one already

OpenStudy (afrodiddle):

teamwork

OpenStudy (afrodiddle):

I gave one back

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