Consider the definition: An isosceles triangle is a triangle that has two congruent sides. Which result must follow from the definition?

A. If is isosceles, then it has two congruent angles.
B. If in , then is an isosceles triangle.
C. If has two congruent sides, then has two congruent angles.
D. None of These

Answer: B

Mathematics

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A. x⁴ + 2x³ + 5x² + 10x + 20 +
B. x⁴ + 3 +
C. x⁴ + 2x³ + 4x² + 9x + 18 +
D. x⁴ + 3x² +

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Determine if the matrix is in row-echelon form.

A. Yes B. No

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Find an equation of an ellipse satisfying the given conditions.Foci: (0, ±4), vertices: (0, ±5)

A. 25x2 + 9y2 = 225 B. 25x2 + 9y2 = 650 C. 25x2 + 9y2 = 641 D. 25x2 + 9y2 = 425

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Simplify the expression. If any variables exist, assume that they are positive.-15 + 17

A. 2
B. 33
C. -3
D. -32

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