a shaded circular road with a center O, with an outside radius of 50 ft and an inner radius of 36 ft. if asphalt paving cost $0.78 per square ft, what is the cost to the nearest cent of paving the shaded O road. 1) $1,204 2) $ 2,950.33 3) $3,782.47 4) $4,849.33 ??

Question

a shaded circular road with a center O, with an outside radius of 50 ft and an inner radius of 36 ft. if asphalt paving cost $0.78 per square ft, what is the cost to the nearest cent of paving the shaded O road.  1) $1,204 2) $ 2,950.33 3) $3,782.47 4) $4,849.33 ??

anonymous · Answer

2950.33
double integral of r drd(theta) 36<r<50; 0<theta<2pi will give you total area and then multiply by the cost per square foot to find the total cost

anonymous · Answer

thanks! :)