Answer:
1 option or last option are the best choices sorry if I'm wrong.
It should be C. Equilateral triangles
Answer:
Multiply all the numbers and you will get your answer. It is 483 cm^3
Hope this helped, have an awesome day and please mark brainliest if u want too.
U^2(2u+3)+7(2u+3)
(u^2+7)(2u+3)