Trent can deliver his newspapers in 40 minutes. It takes Lois 60 minutes to do the same route. How long would it take them to deliver the newspapers if they work together? It will take minutes.

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)