Answer:
18x^2
Step-by-step explanation:
There are no real solutions to solve Z. If there may be a typo or something, there are no solutions.
Answer:
D)the time (in hours) a 4-year-old spends unsupervised per day
Step-by-step explanation:
Given that 4-year-olds in a certain country average 3 hours a day unsupervised and that most of the unsupervised children live in rural areas, considered safe
X - the time (in hours) a 4-year-old spends unsupervised per day
X is N(3,1.8)

Convert to common denominator
3/4 = 12/16
Multiply by 16
(12/16)/(3/16)
12/3
Your answer is 4.
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