LINEAR WORD PROBLEM Devin belongs to the rock climbing gym and pays $ 61 each month. He still needs to pay an additional $ 7 for each lesson. Jared is not a member and has to pay $ 15 for each lesson. How many lessons do they need to take to spend the same amount of money?

Devin continues to pay a monthly fee each month. And they must pay for the whole lesson.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The square root of 9x plus 7 plus the square rot of 2x equall to 7

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