Solve the problem.The Neighborhood Lemonade Stand, Inc. reported net incomes of -$395, -$103, and -$177 for the past three years. What was its total net income for these three years?
A. -$675
B. -$498
C. $675
D. -$280
Answer: A
Mathematics
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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) = (9 tan t)i - (9 sin t)j + (4 cos2 t)k ; t0 = 
A. x = 9 + 18t, y = -
- 
t, z = 4 - 4t
B. x = 18 + 9t, y = -
- 
t, z= -4 + 2t
C. x = 9 + 18t, y = -
- 
t, z = 2 - 4t
D. x = 9 + 18t, y = -
+ 
t, z = 2 + 4t
Mathematics
Factor. Check by multiplying.15 + 15z
A. 15(0 + z) B. 15(1 + z) C. 15(1 + 15z) D. 15(15 + z)
Mathematics
30 gtt = ? t
A. 2t B. 1t C. 1/4 t D. 1/2 t
Mathematics
Graph the polar equation.r = ?, ? ? 0 
A. 
B. 
C. 
D. 
Mathematics