Which combinatorial reasoning error did Batanero et al (1997) find to be the most prevalent among the choices listed below?
a. Changing the problem from one type to another and misinterpreting the meanings of words in a problem
b. Thinking that order matters in cases where it does not (and vice versa)
c. Thinking that identical objects are distinguishable (or vice versa)
d. Using unsystematic strategies for listing the possible combinations for a situation.
Ans: b
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Use the distance formula to find the distance between the pair of points.(4, -7) and (6, -3)
A. 2
B. 2
C. 12
D. 12
Find the slope of a line tangent to the curve of the given equation at the given point.y = 
; 
A. - 
B. 
C. - 
D. 
Graph the quadratic function using its vertex, axis of symmetry, and intercepts.f(x) = x2 + 8x + 7
A. vertex (-4, 9)
intercepts (-1, 0), (- 7, 0), (0, -7)
B. vertex (4, 9)
intercepts (1, 0), (7, 0), (0, -7)
C. vertex (-4, -9)
intercepts (-1, 0), (- 7, 0), (0, 7)
D. vertex (4, -9)
intercepts (1, 0), (7, 0), (0, 7)
The polar coordinates of a point are given. Find the rectangular coordinates of the point.
A. 
B. 
C. 
D. 