Firstly, since they worked 18 hours over 3 days, they worked a total of 6 hours each day. Since Malik worked 2 fewer hours than Tasha, we have that Tasha worked (6+2)/2 = 4 hours each day and Malik worked 2 hours each day.
Here the 2 displayed above is the exponent or power of 5. So, we have to square 5. This means that we have to multiply 5 by itself & the product formed <u>(25)</u> is the correct answer.