Answer:
With 250 minutes of calls the cost of the two plans is the same
Step-by-step explanation:
We must write an equation to represent the cost of each call plan.
For the first plan
Monthly fee
$ 13
Cost per minute
$ 0.17
If we call x the number of call minutes then the equation representing the cost c for this plan is:
For the second plan
monthly fee
$ 23
Cost per minute
$ 0.13
If we call x the number of call minutes then the equation representing the cost c for this plan is:
To know when the cost of both plans are equal, we equate the two equations and solve for x.
With 250 minutes of calls the cost of the two plans is the same: $55.5
9b+63 = 72
9b = 9 (subtract 63 from both sides)
b = 1 (divide both sides by 9)
B. incenter
The incenter is the point on the interior of the triangle that is equidistant from all sides. Since a point interior to an angle that is equidistant from the two sides lies on the angle bisector, then the incenter must be on the angle bisector of each angle of the triangle.
The incenter will be the center of an inscribed circle because it is equidistant from all three sides, hence the equal radii of the inscribed circle.
Circumcenter, on the other hand, is used to find the center of a CIRCUMSCRIBED circle around the triangle touching all three vertices.
