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Dafna11 [192]
3 years ago
7

4a/5 (10a-25b) pls help me !ill give brainlist

Mathematics
1 answer:
WITCHER [35]3 years ago
5 0

Answer:

8a² - 20ab

Step-by-step explanation:

4a/5 (10a - 25b)

8a² - 20ab

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For the 1st one its...

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Suppose you like to keep a jar of change on your desk. Currently, the jar contains the following: 17 Pennies 10 Dimes 19 Nickels
MatroZZZ [7]

Answer:

0.0688 = 6.88% probability that you reach into the jar and randomly grab a nickel and then, without replacement, a penny.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

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Probability of grabbing a penny, considering the first coin grabbed was a nickel:

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P(A \cap B) = P(A)P(B|A) = \frac{19}{69} \times \frac{1}{4} = \frac{19}{69*4} = 0.0688

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6 0
3 years ago
At a bookstore, you buy a calendar for $5 and some books for $3 each. You spend a total of $26. How many
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You buy 7 books

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*subtract 5 to the 26 side*
3b=21
Now divide 21 by 3
B=7
So there are 7 books bought. ^^
7 0
3 years ago
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