With controlled variables: 600 à (3/5) = (600 ÷ 5) à 3 = 120 à 3 = <<120*3=360>>360.
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- A historian analyzes 960 experiments recorded in early scientific journals. 5/8 were in physics, and 3/5 of those used controlled variables. How many physics experiments used controlled variables?
- Physics experiments: 960 à (5/8) = (960 ÷ 8) à 5 = 120 à 5 = <<120*5=600>>600.
- A microbiologist measures enzyme activity in a culture doubling every 3 hours. Starting with 800 units at t=0, and knowing activity is directly proportional to enzyme units, what is the total activity after 15 hours?
- Number of doubling periods: 15 ÷ 3 = <<15/3=5>>5.
- Final enzyme units: 800 Ã 2âµ = 800 Ã 32 = <<800*32=25600>>25,600.
