Add or subtract as indicated. Express the answer in pounds and ounces.20 lb 15 oz + 17 lb 4 oz
A. 37 lb 3 oz
B. 38 lb 4 oz
C. 38 lb 3 oz
D. 37 lb 4 oz
Answer: C
Mathematics
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State the name of the property illustrated.6 + 1 = 1 + 6
A. Additive identity B. Commutative property C. Associative property D. Distributive property
Mathematics
For the smooth curve r(t), find the parametric equations for the line that is tangent to r at the given parameter value 
r(t) = (4t2 - 4t)i + (t + 9)j + k ; t0 = 2
A. x = 8 + 12t, y = 11 + t, z = 1 B. x = 8 + 12t, y = 11 + t, z = 0 C. x = 12t, y = t, z = t D. x = 8 + t, y = t, z = t
Mathematics
Graph the equation by plotting points.y = -5x 
A. 
B. 
C. 
D. 
Mathematics
Simplify. Assume that all variables represent positive real numbers.7
- 5
A. 18
B. 2
C. -18
D. 7
- 5
Mathematics