If 30 men can do a work in 8 days how many men can do the same work in 12 days ​

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?