5. Melissa bought a pencil for $0.34, an eraser
1 answer:
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Answer:
2401
Step-by-step explanation:
Given that we want to estimate average income in a population.
The standard deviation of income in the population is $1,000
We want confidence interval around our estimate to be +/- $40
i.e Margin of error = 40
We know that margin of error = Std error * Z critical for 95%
i.e.
Std error =
Together we get
Answer:
Step-by-step explanation:
we know that
The equation of a vertical parabola into vertex form is equal to
where
(h,k) is the vertex of the parabola
if a>0 -----> the parabola open upward (vertex is a minimum)
if a<0 -----> the parabola open downward (vertex is a maximum)
<u>Verify each case</u>
case A)
The vertex is the point
a>0 -----> the parabola open upward (vertex is a minimum)
The range is the interval--------> [5,∞)
case B)
The vertex is the point
a<0 -----> the parabola open downward (vertex is a maximum)
The range is the interval--------> (-∞,5]
case C)
The vertex is the point
a>0 -----> the parabola open upward (vertex is a minimum)
The range is the interval--------> [4,∞)
case D)
The vertex is the point
a<0 -----> the parabola open downward (vertex is a maximum)
The range is the interval--------> (-∞,4]