If a, b, c, and d are positive integers that add up to 20 they each must be less than 20. If abcd=81 then a, b, c, and d must be factors of 81. The factors of 81 are 1,3,9 then 27, so there is no solution to this problem.
13
no because it has an equal symbol in it
few errors in your title: 2 plus 4 = 6 6 plus 9 = 15 10 plus 25 = 35 18 + 81 = 99
Yes. The answer is......................................................................................................................................................................................................................................................2.
n=2.3
6
That equals 550.
9n + 18 = 81 9n = 63 n = 7
9x+27 = -81 9x = -81-27 9x = -108 x = -12
23
V= 47. 81 + 47 - 13= 47.