This is a two-step sequence.
when n is even, tn = 4*tn-1
and when n is odd, tn = tn-1 + 1
4.2
It is: 20/84 = 5/21 in its simplest form
80 over 84 simplified = 20/21
20/21
The GCF of 21 and 84 is 21, since it is a factor of 84. The LCM of 21 and 84 is 84, since it is a multiple of 21.
The numbers fit the quintic function: t(n) = (27n5 - 556n4 + 4253n3 - 14876n2 + 23440n - 11784)/24 for n = 1, 2, 3, etc
21
it is 21
84%. You get this by dividing 21 by 24 and you get .84 which is 84/100ths equaling 84%.
21 is one quarter of 84 so it is 25%
The answer is 84 21:21,42,63,(84) 28:28,56,(84)
20 x 84 = 1680 20% of 84 is 16.8