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1 answer:
Step-by-step explanation:
<u>Given function:</u>
- y = |x + 4| - 1
<em>See the graph below</em>
According to the graph we see that
The minimum is (-4, -1) and zero's are (-5, 0) and (-3, 0)
<u>Function is positive: </u>
- When x < - 5 and x > -3
<u>Negative:</u>
- When x is between -5 and -3
<u>Increasing:</u>
- When x > -4
<u>Decreasing:</u>
- When x < -4
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So 3 have no pets, so 25 - 3 = 22 students have a pet.
There are 15 cats and 16 dogs so 15 + 16 = 31.
And then 31 - 22 = 9. The 9 means that 9 students have both pets.
So the probability is 9/25.
