3 years ago

Does the following table show a proportional relationship?

Mathematics

1 answer:

just olya [345]3 years ago

3 0

No the cost of 9 shirts is incorrect.

120 would be the cost of 8 shirts, as each shirt costs $15.

I hope this helps!

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In the lottery every week, 2,000,000 tickets are sold for $1 apiece. Say 4000 of these tickets pay off $30 each, 500 pay off $80

jarptica [38.1K]

The expected value is just the weighted average of how much one ticket wins. To calculate it, we need to find the probabilities of winning each dollar amount, multiply each probability with it's respective dollar amount, then find the sum.

Let's call the winnings from one ticket X:

P(X=30) = 4000/2000000 = 0.002

P(X=800) = 500/2000000 = 0.00025

P(X=1200000) = 1/2000000 = 0.0000005

E(X) = 30*P(X=30) + 800*P(X=800) + 1200000*P(X=1200000) = 0.06 + 0.2 + 0.6 = 0.86

The answer is $0.86

4 0

4 years ago

44,35,26complete the sequence

Sloan [31]

Step-by-step explanation:

44-9=35

35-9=26

26-9=17

17-9=8

5 0

3 years ago

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Need help with this question. I tried simplifying the radical, but apparently it’s not the answer

sesenic [268]

Answer:

-1/5+(√3)/20i or -0.2+0.05√3i

Step-by-step explanation:

$\dfrac{-8+\sqrt{-12}}{40}=-\dfrac{8}{40}+\dfrac{2\sqrt{3}i}{40}=\boxed{-\dfrac{1}{5}+\dfrac{1}{20}\sqrt{3}\,i=-0.2+0.05\sqrt{3}\,i}$

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<em>Comment on answer form</em>

Satisfying the input format requirements of a computer is always problematic. One never knows if fractions or decimals are preferred, whether radicals must be simplified, and so on. If no clues are offered by general instructions, other questions, or previous experience, then it might be useful to consult your instructor.

4 0

3 years ago

-1/x-3=x-4/x^2-27<br><br> help me on this math problem please

kati45 [8]

191/1530 is the answer

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3 years ago

In the diagram of circle P, m∠XYZ is 72°. What is the value of x? 108° 144° 216° 252°

mezya [45]

Answer: 108°

Step-by-step explanation: just took the test

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3 years ago

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