Answer:
k=20
Step-by-step explanation:
The constant of proportionality, k, measures the constant value of the ratio between two proportional quantities, being y and x in this case. Essentially, y/x will always equal 20, the constant of proportionality.
B) 1/4c^4
Because 3/12=1/4 and c^8/c^12=1/c^4.
