Mike can build a go cart in 30 days, jed can build one in 20 days and erick in 60 days. if all of them share the work, how quickly can they build a go cart? i know the answer is 10, but how do i get to that?

What aspects of lines have to be diffrent

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100