Perform the indicated operation.-13 + (-6)
A. 7
B. -7
C. -19
D. 19
Answer: C
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Compute r''(t).r(t) = (2 cos t)i + (3 sin t)j
A. r''(t) = (-2 cos t)i + (-3 sin t)j B. r''(t) = (2 cos t)i + (3 sin t)j C. r''(t) = (-2 sin t)i + (-3 cos t)j D. r''(t) = (2 sin t)i + (3 cos t)j
Factor by grouping.x3 + 8x2 + x + 8
A. (x2 + 1)(8x + 8) B. (x2 + 8)(x + 1) C. (x2 + 1)(x + 8) D. (8x2 + 8)(x + 1)
Name the property illustrated by the statement.4 ? 1 = 4
A. commutative property of multiplication B. multiplicative inverse property C. identity element for multiplication D. distributive property
Solve the problem.In a school survey, students showed these preferences for instructional materials. Answer the question. 
About how many students would you expect to prefer TV in a school of 400 students?
A. About 48 students B. About 12 students C. About 72 students D. About 80 students