In an equation, y varies directly as x varies. If y = 42 when x = 56, what is
the value of x when y = 18?
A )24
B )28
C )32
D )36

It's going to be B.

Step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)