Cho hàm số y=x^3+2mx^2+(m-1)x-3 .Tìm m để hàm số đồng biến trên R .

Customers at an ice-cream shop took a survey .the results showed that 144 customers rated the shop as being "very satisfactory ."this number represented 45%of the total nunber of customers who took the survey

Franco wants to double the volume of the cone. what should he do?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?