Which statement is true about the composite solid?

The solid has a total of 9 faces.

There are the same number of triangular faces as there are rectangular faces.

The solid is formed by joining a rectangular pyramid and a triangular prism at a common face.

If all of the triangular faces are congruent, then all of the rectangular faces must be congruent as well.

C

Step-by-step explanation:

The solid is formed by joining a rectangular pyramid and a triangular prism at a common face.

See evidence at attached picture

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!