I need help finding the volume for number 7 and number 8, and also what formula did you used so I can understand it. Thanks

Which letters from the table represent like terms? a and b b and c a and d b and d

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.