find the constant of proportionality for the graph and write in the form y = kx.
a) y =
1
6
x
b) y = 6x
c) y = 7x
d) y = 42x

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is