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tatyana61 [14]
3 years ago
8

Jamie has a deck of 60 sports cards, of which some are baseball cards and some are football cards. Jamie pulls out a card random

ly from the deck, records its type, and replaces it in the deck. Jamie has already recorded three baseball cards and nine football cards. Based on these data, what is, most likely, the number of baseball cards in the deck? 12 15 24 30
Mathematics
2 answers:
balu736 [363]3 years ago
8 0

Answer:

15

Step-by-step explanation:

The proportion between baseball and football cards is 3 to 9, which is equivalent to 1 to 3, that means if you pull out a card you have a probability of 1/4 to get a baseball card and 3/4 a football card.

60/4 = 15, then instead of 1/4 we can say 15/60 (= 1/4 * 15/15) and instead of 3/4 we can say 45/60 (= 3/4 * 15/15). So, based on these data, there are 15 baseball cards and 45 football cards.

Snezhnost [94]3 years ago
3 0
The number is most likely 15 because if you one recorded 3 baseball cards and 9 baseball cards it would be most reasonable to have it be 15
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A person who weighs 240 pounds burns 180 calories per mile of running. If a person burns thirty-six calories by running one mile
fiasKO [112]
Well I figure you would use a ratio. we are given one when comparing 240 lbs to 180 calories for each mile:
240lbs/180calories = 1 mile

we.are.given another when saying a person. burns 36 calories in 1 mile. we don't know weight so we will say x lbs:
x/36calories = 1 mile

since they both equal 1 mile we know they are equal:
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we can get rid of the 1 in between and say:
240/180 = x/36

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3 years ago
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6 0
3 years ago
2^x-1=128<br><br><br> show work pls! thank u :)
hichkok12 [17]

Hello from MrBillDoesMath!

Answer:

Take you pick below!   (either x 8 or x = 7.01, approx, depending how the question is interpreted)




Discussion:

Interpretation 1

If the question is   2^(x -1)  = 128, then as 2^7 = 128,

x-1 = 7 so x = 8



Interpretation 2

If the question is (2^x -1) = 128, then..

2^x  = 128 + 1 = 129  =>

log(2^x) = log(129) =>

xlog(2) = log(129) =>

x = log (129) / log2 = 7.01

Regards,  

MrB

4 0
3 years ago
A box has 16 candies.12 red and 4 yellow.If you were picking candies from the box without looking.How many candies would you hav
jeka57 [31]

We want to get the probability of randomly picking two candles of the same color. We will see that this probability is 0.6

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The joint probability is given by the product of the two individual probabilities:

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