The figure below shows a right rectangular prism whose base is a 2 \times 22×22, times, 2 square and whose height is 444. Which shape does the intersection of the vertical plane with the prism look like?
Choose 1
Choose 1

(Choice A, Checked)
A
tall rectangle

(Choice B)
B
regular octagon

(Choice C)
C
equilateral triangle

(Choice D)
D
square

Identify whether the figure has plane symmetry, symmetry about an axis, or neither.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?