PLEASE HELP (i dont know whats going on...) {75 points} Suppose you have n items from which you choose r at a time. Explain why you must divide the number of permutations n!/(n−r)! fraction n factorial , over open n minus r close factorial end fraction by r! to find the number of combinations n!/r!(n−r)!

ab: 2 n83b8eb7ebi. 8e yen in

3 1/3 x 2 3/5 = 8 2/3

step-by-step explanation:

just multiply the first number by the second number to get your answer.

answer is 8x+24

area of vanessa's patio = length × width

given, length = (3x² + 5x + 10)

width = (x² - 3x - 1)

area of vanessa's patio = (3x² + 5x + 10)(x² - 3x - 1)

= 3x²(x² - 3x - 1) + 5x(x² - 3x - 1) + 10(x² - 3x - 1)

= 3x⁴ - 9x³ - 3x² + 5x³ - 15x² - 5x + 10x² - 30x - 10

= 3x⁴ - 4x³ - 8x² - 35x - 10

hence, expression of vanessa's patio = (3x⁴ - 4x³ - 8x² - 35x - 10)

step-by-step explanation: 2