Find the length of the curve.x = 7 sin t - 7t cos t, y = 7cos t + 7t sin t, 0 ? t ? 
A. 
?2
B. 
?2
C. 
?
D. 
?2
Answer: D
Mathematics
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Perform the indicated operation. Write the answer in scientific notation.(4.3 × 104)(2.2 × 105)
A. 9.46 × 109 B. 956 × 1018 C. 9.56 × 109 D. 946 × 107
Mathematics
Solve.x2 + 12 < 4x
A. {4} B. (4, ?) C. (-?, -4) D. ?
Mathematics
Find an equation of a parabola that satisfies the given conditions.Horizontal axis; vertex (3, -7); passing through (0, 1)
A. (x + 3)2 = - 
(y - 7)
B. (x - 3)2 = - 
(y + 7)
C. (y + 7)2 = - 
(x - 3)
D. (y - 7)2 = - 
(x + 3)
Mathematics
Decide whether the dose is reasonable or unreasonable. If it is unreasonable, indicate whether it is too much or too little.Take 3.3 kg of calcium per day.
A.
| Unreasonable, too little |
B.
| Reasonable |
C.
| Unreasonable, too much |
Mathematics