Andrea and Heather have participated in competitive weightlifting for several years. The amount of weight, W, each can lift (in kilograms) is a function of the number of years, t, she has been liftin

Andrea and Heather have participated in competitive weightlifting for several years. The amount of weight, W, each can lift (in kilograms) is a function of the number of years, t, she has been lifting. Andrea's performance is approximately modeled by WA=81.6+9.29lnt.

Heather's model is WH=82.4+8.75lnt.

Write an equation the models the number of t years when Andrea and Heather lift the same amount of weight.

The girls could lift the same weight at

years. (Round to the tenths place.)