Segment AB is on the line y − 4 = −5(x − 1), and segment CD is on the line y − 4 = one fifth(x − 5). Which statement proves the relationship of segments AB and CD?

They are perpendicular because they have slopes that are opposite reciprocals of 5 and negative one fifth.
They are perpendicular because they have slopes that are opposite reciprocals of −5 and one fifth.
They are parallel because they have the same slope of 5.
They are parallel because they have the same slope of negative one fifth.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Given the net of the rectangular prism, what is its surface area?

If f(x)=-3x+2 and g(x)=-7x-2, which point represents f(x)=g(x)?