Estimate the total cost of 1.85+.98+3.49+9.78+6.18 rounding off to the nearest half dollar

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.