Answer:
No
Step-by-step explanation:
Because in a function for every one x there is one y.
YES.
f(x) = 3x^2.
This is a parabola which opens upwards ( roughly U shaped) so it will pass the vertical line test and is a function.
B
A
The markings indicate that all three sides of each triangle correspond with one another meaning that they are congruent by the SSS (Side, Side, Side) postulate.