Find the difference and simplify the answer. 
A.
B.
C.
D.
Answer: D
Mathematics
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A triangle with vertices at (x1, y1), (x2, y2), and (x3, y3) has area equal to the absolute value of D, where . Use this information to solve the problem.Use D to find the area of the triangle shown.
A. 31.25 B. 31.5 C. 30.0 D. 29.75
Mathematics
Solve the equation.7x2 = 5x
A. ,
B. , 0
C. - ,
D. , 0
Mathematics
Write a mathematical expression for the word phrase.Fifteen is at most nineteen
A. 15 ? 19 B. 15 ? 19 C. 15 < 19 D. 15 ? 19
Mathematics
Perform the division.(x4 - 81) ÷ (x + 3)
A. x3 + 3x2 - 9x + 27 B. x3 + 3x2 + 9x + 27 C. x3 - 3x2 + 9x - 27 D. x2 + 3x + 9
Mathematics