Given:
The shaded sector above covers
of the circle.
Radius of the circle = 3 cm
To find:
The area of the sector in terms of π.
Solution:
The area of a circle is

Substituting
, we get


It is given that the shaded sector above covers
of the circle.
The area of shaded sector 


Therefore, the area of shaded sector is 3π sq. cm.
$1.2 is the sales tax I think. I did 40 x .03
A graph can show that a rate of change is constant as long as the graph is of a straight line.
Any curvature in the line suggests a rate of change that is variable, but otherwise it is constant.
76+20x
factor out 4
4 (19+5x)
so one possible dimensions of the rectangle is 4 by 19+5x