Answer:
to grow bacterial cultures
12 presents
Step-by-step explanation:
4/6= 2/3
2/3 x 18 = 12
I think that X2 should be x squared
336
explanation:
percent. part
_______ = _____
100. whole
42. ?
____ = ____
100. 800
cross multiply
800×42=33,600
then divide by 100
33,600/100=336
