Solve the system of equations using elimination: x+4y-5x=-7 3x+2y+3z=7 2x+y+5z=8
1 answer:
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Probability of the students having brown hair = 0.6
Probability of the students having brown eyes = 0.3
Probability of the students having both brown hair and brown eyes = 0.1
Step-by-step explanation:
Step 1 :
Given,
Percentage of the students having brown hair = 60%
Percentage of the students having brown eyes = 30%
Percentage of the students having both brown hair and brown eyes = 10%
We need to obtain the probability of each separately, when a student is chosen randomly
Step 2 :
The probability of each event happening given its percentage, can be obtained by dividing the corresponding percentage by 100.
Hence we have,
Probability of the students who have brown hair = = 0.6
Probability of the students who have brown eyes = = 0.3
Probability of the students who has both brown hair and eyes = = 0.1
Step 3 :
Answer :
Probability of the students who have brown hair = 0.6
Probability of the students who have brown eyes = 0.3
Probability of the students who has both brown hair and eyes = 0.1
Answer:
see explanation
Step-by-step explanation:
(1)
x² + 4 = 0 ( subtract 4 from both sides )
x² = - 4 ( take the square root of both sides )
x = ± = ± 2i ← complex solutions
(2)
x² - 81 = 0 ( add 81 to both sides )
x² = 81 ( take the square root of both sides )
x = ± = ± 9 ← real solutions