What type of quadrilaterals can be formed using two equilateral triangles

Squares and Rectangles can be formed by using two equilateral triangles.

 a diamond
join the 2 triangles together
than you get a diamond

Hope this helped

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.