Answer:
See the explanation below.
Step-by-step explanation:
Starting from
By putting we have:
i think the answer is C. 1/2
Some of the 50 students should have been assigned to a control group that used the in-person course
(xy - 4)(xy + 4).
The is the difference of 2 squares.
a^2 - b^2 = (a - b)(a + b: so we have:
x^2y^2 - 16 = (xy - 4)(xy + 4)
