Answer:
The second option which is 9π
Step-by-step explanation:
Well the fromula for finding area of a circle is
a=πr^2
We have the radius which is 3
3^2=9
9*π= 9π
9π=a
A community group bought 30 tickets to an amusement park at a total cost of $810. They bought x student tickets for $25 each and y adult tickets for $30 each.
***
let x=number of student tickets bought
30-x=number of adult tickets bought
..
25x+30(30-x)=810
25x+900-30x=810
5x=90
x=18
30-x=12
number of student tickets bought=18
number of adult tickets bought=12
Hope this helps!
Answer:
Step-by-step explanation:
The formula of a volume of a cube:
<em>a</em> - edge
We have
Convert to the improper fraction:
Substitute to the formula of a volume: