Bài 1: Có tất cả bao nhiêu giá trị của m nguyên để hàm số: y = x8 + (m - 2)x5 - (m2 - 4)x4 + 1 đạt cực tiểu tại x = 0?

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?