Final answer:
The expression 300t2 - 0.5 ÷ t evaluates to 9.5 when t = 0.2.
Step-by-step explanation:
To evaluate the expression 300t2 - 0.5 ÷ t when t = 0.2, you substitute 0.2 for t in the equation:
(300 * 0.22) - (0.5 ÷ 0.2)
First, calculate the square of 0.2:
0.22 = 0.04
Next, perform the multiplication:
300 * 0.04 = 12
Then, divide 0.5 by 0.2:
0.5 ÷ 0.2 = 2.5
Finally, subtract the result of the division from the result of the multiplication:
12 - 2.5 = 9.5
Therefore, the value of the expression when t = 0.2 is 9.5.