?ABC is isosceles with AB ? AC and ?A = 60°. Prove that ?ABC is equilateral
?B = ?C since they are opposite congruent sides. Also, their sum is 120°. Hence ?A = ?B =?C = 60°, so ?ABC is equilateral.
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Solve the variation problem.According to Ohm's law, the electric current I, in amperes, in a circuit varies directly as the voltage V. When 14 volts are applied, the current is 3 amperes. What is the current when 23 volts are applied?
A. 4.67 amperes B. 40 amperes C. 4.93 amperes D. 107.333333 amperes
Round the whole number to the given place.217,864 to the nearest ten thousand
A. 300,000 B. 217,000 C. 220,000 D. 210,000
For this problem, let 
, and 
, and find
tan ?
What will be an ideal response?
Find the unknown length in the right triangle. If necessary, approximate the length to the nearest thousandth.
A. 15 in. B. 21.633 in. C. 468 in. D. 234 in.