Use Heron's formula to find the area of the triangle. Round to the nearest square unit.a = 4, b = 10, c = 8
A. 15
B. 36
C. 17
D. 38
Answer: C
Mathematics
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Find the indicated term for the sequence.an = (-1)n-2(6.6n - 13.7) ; a20
A. 118.3 B. 132 C. -118.3 D. -7.1
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Identify the conic section represented by the equation.15y2 = 9x - x2
A. hyperbola B. circle C. ellipse D. parabola
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Find all values of a for which f(a) is the indicated value.f(x) = 
; f(a) = 
A. 
B. 
C. - 
D. - 
Mathematics