Math 8R: Homework Check  Part 3
posted by Laruen .
Part 3 : Evaluate when x = 2, y = 5
21. 4x + 2y, Answer: 2
22. 3(x) *to the 3rd power*, Answer: 221
23. (x + y) *to the 2nd power*, Answer: 9
24. 4x + 2y, Answer: 18
Please check to see if my answers are correct. Thank You!!! :)

#21. ok
#22.
3x^3 = 3(2)^3 = 3(8) = 24
(3x)^3 = (6)^3 = 216
Not sure how you came up with 221, since 221 is neither a perfect cube, nor a multiple of 3.
#23. ok
#24. ok