Five times the sum of some number plus 3 is equal to 7 times the number minus 1.

Write a real-world solution that can be represented by the equation y = 7x be sure to explain what the variables represented in the solution

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters