M(x) = 3x^3–2x+4x^2–x+5 N(x) = 2x^2–x+3x^3–3x^2+9 a). Thu gọn các đa thức trên theo lũy thừa giảm dần của biến b). Tính M(x)+N(x) c). Tìm nghiệm của đa thức P(x)=M(x)+N(x)–6x^3–3x^2–2x

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median amount spent? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )