It does not "mean" anything.
t(n) = 100 - (n-1)2, n = 1, 2, 3, ...
or equivalently,
t(n) = (11 - n)*(9 + n)
The sequence subtracts consecutive odd numbers. In this sequence it goes -1, -3, -5, -7. The next number will be 75 (84 - 9).
70, 77, 84, 91 & 98
89+84+90+94+98=455 455/5= 91 91 is the mean.
91.
91 + 84 = 175
S = 955 This is an arithmetic sequence, and the sum of an arithmetic sequence can be calculated as: S = n/2 x (U1 + Un) U1 is the first term (in this case 91) and Un is the last term (in this case 100). n presents the total number of terms in the sequence There are 10 numbers in this sequence (91, 92, 93, 94, 95, 96, 97, 98, 99, 100) So, the sum is : S = 10/2 x (91+100) = 955
If you mean: 21, 84 and 91 then it is 7
The GCF of 84 and 91 is 7.
88,84,100,84,0,100,100,91,100= 83 for the class
175 - 84 = 91
The HCF of 21, 84 and 91 is.... 1 ! The number 91 is a prime number.
80, 81, 82, 84, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100.