A thin silver wire has length L = 18 cm when the temperature is T = 30C. Estimate L when T decreases to 25C if

A thin silver wire has length L = 18 cm when the temperature is T = 30°C. Estimate ΔL when T decreases to 25°C if the coefficient of thermal expansion is k = 1.9 × 10⁻⁵°C⁻¹ (see Example 3).

EXAMPLE 3 Effect of an Inexact Measurement The Cheezy Pizza Parlor claims that its pizzas are circular with diameter 50 cm (Figure 3). (a) What is the area of the pizza? (b) Estimate the quantity of pizza lost or gained if the diameter is off by at most 1.2 cm.