Max can mow a lawn in 45 minutes. jan takes twice as long to mow the same lawn. if they worked together, how long will it take them to mow the lawn

Max can mow a lawn in 45 minutes. Jan takes twice as long to mow the same lawn. If they work together, how long will it take them to mow the lawn?
15.0 minutes
22.5 minutes
30.0 minutes
120.0 minutes

Does the expression x^3-1/x^2-1 simplify to x?
No, x^3-1 can be factored as x(x^2-x+1) and x^2-1 can be factored as x(x-1), so only x can be canceled

Yes, x^3(x-1) can be factored as x^2(x-1) and x^2-1 can be factored as x(x-1), so (x-1) can be canceled

No, because the –1 in the numerator and denominator is not a common factor and can't be canceled.

No, because the –1 in the numerator and denominator is not a common factor and cannot be canceled.

Yes, because –1 in the numerator and denominator is a common factor and can be canceled.

The correct answer is addition