A surveyor measures the distance across a straight river by the following methods: Starting directly across from a tree on the opposite bank, she walks 100 m along the river bank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is 35 degrees. How wide is the river?

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.