Am I correct for the choices I picked?

If not what are the correct choices?

Which of the lines are parallel?
(1) a and b
(2) a and c
(3) b and c

Which of the lines are perpendicular?
(1) a and D
(2) b and D
(3) c and D

Please show all the work on how you got your answer.

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Simone claims the initial value and y-intercept are the same thing on a graph. is she correct? if you know that a line has a slope of and a y-intercept of 7, what is the equation for that line in slope-intercept form?

How is the number of vertices for a prism related to the name of the prism