1. The problem statement, all variables and given/known data Show that the change in the density ρ of a substance, when the temperature changes by ΔT, is given by Δρ = −βρ ΔT. (b) What is the fractional change in density of a lead sphere whose temperature decreases from 25°C to −40º C? 2. Relevant equations βLead= 87x10-6 3. The attempt at a solution ok i already go the first part, but i dont think im doing b right. im just plugging in (-40-25) for temperature, and the β of lead. so Δρ = −87x10-6ρ ρ=176.8Δρ i doubt thats the answer. am i misunderstanding the question here? or am i just doing something completely wrong?