Question

[please help]

Peter is conducting a chemical experiment in a controlled environment. The initial temperature of the chemical solution was 20°C. The temperature of the solution was 1.5 times the initial temperature after 3 minutes. The temperature of the solution continued to increase at this rate. This situation is graphed below.

Let x represent the number of minutes passed after the start of the experiment, and let f(x) represent the temperature of the solution.

Once the temperature reached 45°C, the experiment was stopped. Over which interval did Peter conduct the experiment?

Answer 1

B. 0 ≤ x ≤ 6

Explanation:

Answer 2

B. 0 ≤ x ≤ 6

Explanation:

The horizontal grid lines are 10 °C apart, so 45 °C corresponds to a vertical position halfway between the 4th grid line and the one marked 50.

The graph intersects that position at the 2nd vertical grid line. The vertical grid lines are 3 minutes apart, so the 2nd grid line represents 6 minutes.

If Peter conducted the experiment from its start until the temperature reached 45 °C, he conducted it over a period of 0 to 6 minutes, inclusive:

0 ≤ x ≤ 6