Write the number in scientific notation.2,800,000
A. 2.8 × 10-7
B. 2.8 × 107
C. 2.8 × 106
D. 2.8 × 10-6
Answer: C
Mathematics
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A. - 
B. - 
C. 
D. -41
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Find the exact value of the expression.sin 260° cos 20° - cos 260° sin 20°
A. - 
B. - 
C. 
D. - 
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Find the relative extrema of the function. Find the relative extrema of trigonometric functions on [0, 2? ]. List your answers in terms of ordered pairs. Then sketch a graph of the function.
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Solve the system by the addition method.8x + 6y = 284x - 2y = 24
A. {(4, -1)} B. {(5, -2)} C. {(5, -1)} D. ?
Mathematics