4-x I know this because my teacher just went over this problem
$3.99/24oz= $0.16/oz (smaller size)
$6.99/64oz= $0.10/oz (larger size)
The larger size has the lower unit costs.
Answer:

Step-by-step explanation:
the formula for density is:

where d is density, m is mass, and V is volume.
solving for m in the last equation:

so if we find the volume and multiply it by the density
we will get the mass of the object.
The volume of a rectangular prism is given by:

where
is length,
is width and
is height:

we substitute to find the volume:

since the density has units of
we need the volume also in units of
, so we make the conversion using:

multiplying by 30:

and now we find the mass with the equation:

substituting d and V:

the nearest gram is: 
Answer: C
Step-by-step explanation:
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