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3 years ago

6

Mike has a stack of 10 cards numbered from 1 to 10. He randomly chooses a card and without replacing the first card drawn, rando

mly chooses a second card. What is the probability that mike would pick 2 cards that are prime numbers
?

1 answer:

ch4aika [34]3 years ago

4 0

Answer:

2/15

Step-by-step explanation:

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Please help math

Naddika [18.5K]

$\displaystyle\\
15(2a - 2) = 5(a^2 -1) \\ \\ 
30a - 30 = 5a^2-5\\\\
-5a^2 + 30a -30 + 5 =0\\\\
-5a^2 + 30a -25 =0 ~~~~~\Big| \times (-1) \\\\
5a^2 - 30a +25 = 0~~~~~\Big| : 5 \\\\
a^2 - 6a +5 = 0 \\ \\ 
a_{12}= \frac{-b\pm \sqrt{b^2-4ac}}{2a}= \frac{6\pm \sqrt{36-20}}{2}= \frac{6\pm \sqrt{16}}{2}=\frac{6\pm 4}{2}= \boxed{3\pm 2} \\ \\ 
a_1 = 3+ 2 = \boxed{5}\\\\
a_2 = 3-2 = \boxed{1}$

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3 years ago

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9. The 10,000 seat stadium is 89% full. How many people are watching the game inside the stadium? with solution pls.

Ksivusya [100]

Answer:1100

Explanation:89% of 10,000 is 8900 subtract 8900 from 10,000 bam you got 1100

your welcome

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3 years ago

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Whats the answer for 10x+5>25

jok3333 [9.3K]

Answer:

3 (or x > 2)

Step-by-step explanation:

If your answer is only taking integers, then the first integer that would make this statement true would be 3. If it's for any numerical value, then the inequality would be true for any value above 2.

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Pavlova-9 [17]

Answer:

This is what internet says. Maybe this helps.

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Assoli18 [71]

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