Use identities to write the expression as a function of x alone.cos (x + 90°)
A. -cos x
B. -sin x
C. cos x
D. sin x
Answer: B
Mathematics
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Replace the Cartesian equation with an equivalent polar equation. (x - 20)2 + (y + 3)2 = 400
A. r2 = 40r sin ? - 6r cos ? - 9 B. r2 = 40r cos ? - 6r sin ? - 9 C. r = 40 cos ? - 6 sin ? - 9 D. r2 = -20r cos ? + 3r sin ? + 400
Mathematics
Perform the indicated operations and simplify the result so there are no quotients.
- 1
A. 0 B. - sec2? C. 1 D. 1 - sin ?
Mathematics
Graph the linear inequality.x + y < -2
A. 
B. 
C. 
D. 
Mathematics
Write the following as a rate in lowest terms.534 miles in 18 hours
A. 
B. 
C. 
D. 
Mathematics