So we have a formula for the surface area of a human body. Onda. We see that it is f w H and R model is that this is equal to zero point 10 91 Yes, W the power of 0.4 to 5 and then that's going to be no times H to the zero point 7 to 5. So with this we want to measure the find s in square feet. We know that the weight is £160. So have f of 1 60 and 70 inches. And we see that this will give us 20 um, approximately 20.52 square feet as a result, and then thistles going to be the surface area of a human body for this case. So assuming that this is a good model, we can say that a human that is £160.70 inches tall, we will approximately find their body to be 20.52 square feet. And again, this is a general estimate. Um, the only thing that we have to keep in mind is that this is a model, so it's supposed toe model. All people that measure these specifications. It won't be exact, Um, but that's how models work. Were able to predict things for a large number of people just given these mathematical models, and that's what makes him really helpful. We also see that this is a great use of multi multi variable functions because that we see that the surface area is determined by not Onley weight but also hyped. So we need to include both on bats, one really useful, uh, 11 useful application of multi variable functions.