Answer:
a) 343
b) 1723
c) 15625
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B, there's only two kinds of acute triangles ands that's a 45,45,90 and a 30,60,90.
It’s 70,000, because it’s in the ten-thousands.
So we know this expression:
7x^2 + 2x.
And we know x = 3.
(7*3)^2 + (2*3)
21^2 + 6.
441 + 6
447