17. what's the circumference of a circle with a diameter of 30 centimeters?

Circumference of circle=2πr

Where r=radius

2r=d

d=diameter

So,2πr=πd

Note,π=227

In this statement,c=circumference

→c=πd

→c=π(30)

→c=π30=227(30)

→c=6607=94.28...

Circumference is 94.28...cms

tickets for the harlem globetrotters

show at michigan state university in

2010 cost $16, $23, or, for vip seats, $40.

total revenue = 16x + 23y + 40z

if 9 times as many $16 tickets were sold

as vip tickets,

x = 9z => x – 9z = 0, if 9 times as many $16 tickets were sold

as vip tickets,

x = 9z => x – 9z = 0, sales of all three kinds of tickets would

total $46,575.

16x + 23y + 40z = 46575, how many of each kind of ticket would

have been sold?

solve for x, y and z

x − 9z = 0

x − y − z = 55

16x + 23y + 40z = 46575

x = 1170

y = 985

z = 130

welcome!