Marissa can use the information she found to estimate how many martial arts students at the school practice every day.
To do this, she can use proportions:
7/12 = x/144
where x is the estimated number of martial arts students who practice every day.
To solve for x, she can cross-multiply:
12x = 7 * 144
x = (7 * 144) / 12
x = 84
So Marissa can estimate that about 84 out of the 144 martial arts students at the school practice every day.