Chemistry
posted by Renee .
The density of water at 17 degrees celcius is 0.998774g/mL and at 18 degrees celcius it is 0.998595 g/mL. Calculate the density of water at 17.7 degrees celcius?

I would subtract the density at 17 from the density at 18, take 0.3 of the difference, and add to the density at 18.