Which is the best definition of a counterexample? a. An example that proves a statement is true.
b. An example that shows a statement is true for only the (k + 1) term.
c. An example that proves a statement is true only for the n = k term.
d. An example that shows a statement is not true.

D. An example that shows a statement is not true.

Step-by-step explanation:

D

(It contradicts)

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x