Charlie is studying the growth of a particular type of plant. He is testing the effects of three growth factors: lighting, age, and temperature. Here are the levels he's testing for each. Growth factor Levels Lighting None, Low, Medium, High, Very high Age 1 month, 2months, 3months, 4 months Temperature 20c 22c 24c He wants to find the number of ways of combining one level from each of the growth factors. How many ways are there