PLease help timed test Marco has drawn a line to represent the perpendicular cross-section of the triangular prism. Is he correct? Explain. triangular prism lying on a rectangular face and a line drawn along the slant height of the triangle Yes, the line should be perpendicular to one of the rectangular faces Yes, the line should be perpendicular to the triangular faces No, the line should be perpendicular to one of the rectangular faces No, the line should be perpendicular to the triangular faces

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.