 this video I'm going to show you how to manipulate the model to get the answers to the first three questions of the practice assessment. So I'm going to follow the instructions and change the green colored sliders so that this is 30 and this is 0.1. Renewable upper limit I'm going to change to 85 and the renewable growth rate to 0.1. So I've done that now I'm going to run the model and I'll look at the ending temperature change so I see it's about 2.13, 2.14 at the very end and so looking at the choices the correct answer is 2.1 degrees C so that's answer C on the test. Number two is what is the lowest pH of the oceans in this case I'm going to have to go to graph page number two so here in pink is the pH and it's dropping all the way down to 8.06 or 8.08 somewhere in there so the closest value in the answers the possible answer is 8.08 so we'll select that one so A is the correct one. Then what is the total cost per person here and it says to click through to page 14 so we're going to skip through all these other plots show all sorts of other parameters to page 14 this is the total cost per capita in thousands of dollars and you can see that it rises to 2.4 thousand per person at the end of the time here so that's D so 3D is the answer for that one and so that's the first