Which of the followeing represents the

4(9+3z)≤12+6z

Yes. there is a constant ratio of number of calories to gram of protein.12/3=24/4=32/8=44/11=4

Iwould say the answer is a

To find the  unit rate, divide the numerator and denominator of the given  rate  by the denominator of the given  rate. so in this case, divide the numerator and denominator of 70/5 by 5, to get 14/1, or 14 students per class, which is the  unit rate.