Determine the measure of arc CAD thanks grade 9-10-11 it is either 240 or 260

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What is the lcm of 16 and 40 ? 24 and 40 ?

The cost of a taxi ride includes an initial charge of $2.00. if a 5km ride cost $6.00 and a 10km ride cost $10.00, determine the cost of a 15km ride.