A + c = 186.....a = 186 - c
9.60a + 5.70c = 1399.50
9.60(186 - c) + 5.70c = 1399.50
1785.60 - 9.60c + 5.70c = 1399.50
-9.60c + 5.70c = 1399.50 - 1785.60
-3.90c = - 386.10
c = 386.10 / 3.90
c = 99....so there were 99 child tickets sold
Answer: The area of shaded section is 491.07 cm²
Step-by-step explanation:
Given: Radius of the circle = 25 cm
Now as shown in figure the shaded region is a quadrant.
Therefore the central angle is 90°
Now as we know
Area of sector is given by
where r is radius and
is central angle
So we have

Hence, the area of shaded section is 491.07 cm²
Answer:
19.228
Step-by-step explanation:
multiply 2.2*2.3*3.8 to get 19 yd^3