The variables x
x
and y
y
vary directly. use the values to find the constant of proportionality, k
k
. then write an equation that relates x

x
and y
y
.

y=72; x=3

k=?
y=?

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample

Which of the following graphs could represent a cubic function?