The change in the amount of time that Alejandro studied on the first day to the amount of time he studied on the last day is given by -30 minutes, the correct option is A.
An equation is a mathematical statement formed when two algebraic expressions are equated using an equal sign.
Alejandro studied for 6 consecutive days.
Let he studied for x minutes on the first day
Next day he studies (x + 5) minutes.
Each day the time is increasing by 5 minutes.
The equation for time he studied each day = x + 5 t
On last day he studied,
= x + 5 * 6
= x +30
The change in the amount of time that Alejandro studied on the first day to the amount of time he studied on the last day is given by
x - x -30
= -30 minutes
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