You can figure out if two fractions are bigger by just cross multiplying the numerator and denominator of each fraction.

Multiply the 5 and 7, and then the 3 and 12. Be sure to start with the numerator of the first fraction.

5 * 7 = 35, 3 * 12 = 36
So

is bigger.
$44.80 I could be wrong let me know
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I think it's 4x? I'm not up to that level of math yet.
Answer:
Bc equals 17.
you must solve for BA and CA, because this is a isosceles triangle and isosceles have 2 equal sides.
BA = CA
then plug in what you find in for x