Which of the following functions represents a cell phone bill if there is a monthly charge of 20 dollars plus 6 cents for each m
2 answers:
Answer:
Option 3rd is correct
Step-by-step explanation:
Let x be the time in minutes and f(x) be the cell phone monthly bill.
Given the statement:
if there is a monthly charge of 20 dollars plus 6 cents for each minute of use
Use conversion:
1 cent = 0.01 dollars
6 cents = 0.06 dollars
" means 0.06 x
then;
the function represents a cell phone monthly bill is given as:
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Answer:
c) parabola and circle: 0, 1, 2, 3, 4 times
d) parabola and hyperbola: 1, 2, 3 times
Step-by-step explanation:
c. A parabola can miss a circle, be tangent to it in 1 or 2 places, intersect it 2 places and be tangent at a 3rd, or intersect in 4 places.
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d. A parabola must intersect a hyperbola in at least one place, but cannot intersect in more than 3 places. If the parabola is tangent to the hyperbola, the number of intersections will be 2.
If the parabola or the hyperbola are "off-axis", then the number of intersections may be 0 or 4 as well. Those cases seem to be excluded in this problem statement.
