Tìm đạo hàm riêng cấp 1 cấp 2 của hàm số: z= X³ - 2Y⁴ + 2XY - Y +1

Anne is twice as old as bill, and bill is 3 years older than christie. the sum of anne s and christie s ages equal 72. find their age difference.?

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.