Các ánh xạ dưới đây có phải là ánh xạ tuyến tính không? (a) Ánh xạ D ∈ L(P(R),P(R)) được định nghĩa như sau
D p = p
′
với p ∈ P(R)

(b) Ánh xạ I ∈ L(P(R), R) được định nghĩa như sau
I p =
Z 1
0
p(x)dx với p ∈ P(R)

It says factor each expression completely 8y+48

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.

Walter is to make cookies for a basketball tournament. he's made 15 cookies so far. his coach asked him to make at least 20 cookies but no more than 55. solve the inequality and interpret the solution. 20 ? x + 15 ? 55