X^2 + 2xy + -x + y^2 + -y + -12
The circumference of the circle is found using the formula C = 2 PI r
Circumference = 2 *PI * 15.5 = 31pi
The angle is 90 degrees, which is 1/4 of a complete circle ( 360 degrees).
The arc length would be 1/4 of the circumference:
Arc length = 31pi / 4 = 7.75PI
Equation: 50+15x=200
solution: x= 10
it would take him 10 weeks to purchase the bike he wants.