Find the acute angle between the lines.(1 + 
) x + (1 - 
) y = -18 and 
x + y = 15
A. 30°
B. 75°
C. 45°
D. 60°
Answer: C
Mathematics
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Evaluate the indicated partial derivative at the given point.z = 8
, 
A. 
B. 160
C. 120
D. 
Mathematics
Which property or identity justifies the statement?Exactly one of the following holds:
< 
, 
= 
, or 
> 
.
A. Trichotomy Identity B. Closure Property C. Density Property D. Transitive Property
Mathematics
In work with alternating current, complex numbers are used to describe current I, voltage E, and impedance Z. These three quantities are related by the equation E = IZ. Solve the equation E = IZ for the missing variable.I = 6 + 5i, E = 30 + 44i
A. Z = 
- 
i
B. Z = 
+ 
i
C. Z = - 
+ 
i
D. Z = 
+ 
i
Mathematics
Solve the equation.x + 
= 
A. 
B. 
C. 
D. 2
Mathematics