Using Green's Theorem, find the outward flux of F across the closed curve C.F = (x - y)i + (x + y)j; C is the triangle with vertices at (0, 0), (4, 0), and (0, 10)
A. 80
B. 0
C. 40
D. 400
Answer: C
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Solve the problem.How many rectangles (of any size) are there in the last two figures? 
? 1 rectangle 
? 3 rectangles 
? 
rectangles 
/> ? 
rectanglesUse inductive reasoning to find a formula for the number of rectangles in a 1 × n strip.
A. 15; 45
In a 1 × n strip there are 
rectangles
B. 15; 45
In a 1 × n strip there are 
rectangles
C. 15; 27
In a 1 × n strip there are 3n rectangles
D. 12; 24
In a 1 × n strip there are 3n - 3 rectangles
Perform the indicated operation and simplify.
+ 
A. 1
B. 
C. 
D. 
Find the focus and the directrix of the parabola.3y2 + 12y + 13 - x = 0
A. Focus: (4, 1); directrix: x = 2
B. Focus: 
; directrix: x = 
C. Focus: 
; directrix: y = 
D. Focus: 
; directrix: x = 
Given that the pair of triangles is similar, find the unknown length of the side labeled with a variable.
A. 20 B. 19 C. 25 D. 12