The number n of copies a machine can make varies directly as the number h of hours it operates. it can make 2000 copies in 15 hours how many copies can it make in 21 hours

Find the solution of system of equation y= x-4 y=4x+2

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

It says factor each expression 49x-28?