Given the two sets, which statement is true?
a = {1, 2}
b = {1, 2, 3, 4}
b a
3 a
4 a
a b
none of the above

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a