Mari has 28 wooden cubes. she want to stack them to form a triangle. each row will have one block fewer than the row below it. how many blocks will be on the bottom of the pyramid?

7 cubes.
imagine that ∆ are the blocks, it should be something like this:
∆
∆∆
∆∆∆
∆∆∆∆
∆∆∆∆∆
∆∆∆∆∆∆
∆∆∆∆∆∆∆
Add up everything 28 comes.

7 blocks will be at the bottom :)

Hope I helped :D

Angle onp = 43°angle lno = 137°angle mnp = 137°

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct