Multiply and simplify any radicals in your answer. Assume that all variables represent positive real numbers.(
- 
)2
A. xy - x
B. 2
- 2
C. xy - 2x
+ x
D. xy + x
Answer: C
Mathematics
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Find the unit tangent vector of the given curve.r(t) = 
i + 
j - 5tk
A. T = 
i + 
j - 
k
B. T = 
i + 
j - 
k
C. T = 
i + 
j - 
k
D. T = 
i + 
j - 
k
Mathematics
The label on a stock medication states that there are 75 mg of medication in 5 mL of solution. If the doctor's order is for 225 mg of medication, how many teaspoons of medication should be given?
A.
| 3 t |
B. 15 t
C. 1 t
D. 5 t
Mathematics
Graph the equation by plotting points.y = 2x + 1
A. 
B. 
C. 
D. 
Mathematics
Find the center and radius of the circle with the given equation. (x + 2.4)2 + 
2 = 
A. (0.75, -2.4); r = 
B. (-2.4, 0.75); r = 
C. (0.75, 2.4); r = 
D. (2.4, -0.75); r = 
Mathematics