In a maths class of 26 students, each girl drew a triangle and each boy drew a rectangle. if there were 92 sides drawn by the students, how many girls were in the class?

Let there be x girls,   and y boys.

Since a triangle is 3 sides, the girls would draw 3x sides.

Since a rectangle is 4 sides, the boys would draw 4y sides.

Recall a total of 92 sides were drawn.

x + y = 26(a)

3x + 4y = 92(b)

From (a) y = 26 - x, substituting this into (b)

3x + 4*(26 - x) = 92

3x + 104 - 4x = 92

3x - 4x = 92 - 104

-x = -12

x = -12/-1 = 12.

Since x is the number of girls, so there are 12 girls

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.