You would cube it. So the answer is B
Answer:
Step-by-step explanation:
3y+21+hy+20 = 90
the sum of two complimentary angles = 90
m+n=90
then solve for y ( i think it is not letter H it has to be a number).
i dont know the answer, but i reccommend using mathpapa.com as they give you the answer PLUS the explaination.
