Write the number in standard form.7.21 × 10-4

A. -721,000
B. 0.0000721
C. 0.00721
D. 0.000721

Answer: D

Mathematics

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Replace the polar equation with an equivalent Cartesian equation. 8r cos ? + 9r sin ? = 1

A. 8x + 9y = 1
B. 8y + 9x = 1
C. 8x + 9y = x2 + y2
D.  +  = 1

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Mathematics

Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with length of major axis 16 and y-intercepts 

A.  +  = 1
B.  +  = 1
C.  +  = 1
D.  +  = 1

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Mathematics

Let . Find the function. ? ? Please give the answer as a simplified expression (not an equation).

What will be an ideal response?

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Mathematics

Solve the given equation.9g = 0

A. g = 0
B. g = 
C. g = 9
D. g = 1

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Mathematics