1) a group of 22 students need to form a line of exactly 9 students. student a and student b need to be either the fifth or sixth in line.
is this arrangement of students a permutation or combination? justify your selection.

step-by-step explanation:

6 equilateral triangles

a 90 degree rotation across the the origin followed by a reflection across the x-axis.

step-by-step explanation:

the answer is:

the lateral area is equal to

to find the lateral area of the square pyramid, first we need to find the perimeter of the base, and then, find the lateral area using the following formulas:

where,

s, is the base length

slant height, is the height of a the side of the pyramid

we are given:

now, calculating the perimeter of the base, we have:

then, calculating the lateral area:

hence, we have that the lateral area is equal to

have a nice day!