Y would equal -17! Good luck!
For the Fist One it’s Pentagonal Pyramid
Answer:
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10 = a
24 = b
30 = c
If a^2 + b^2 = C^2 , the triangle is right
if a ^2 + b^2 > C^2 , the triangle is acute
if a ^2 + b^2 < c^2, the triangle is obtuse
since 100 + 576 < 900 , the triangle is : D. Obtuse
hope this helps