The answer is x < 5 and x > -13.
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12 cups because there are 2 cups in a pint and 2 pints in a quart
√ (1/144) = 1/12
Because √1 = 1 ; √144 = 12
⇒ C
To find the cross product, you can set this up as a proportion. Please see the attached paper for one of the proportions you could use.
You would then multiply the numbers that are diagonal from each other.
You would have 21(8) = 12x or
168=12x.