= |1/2 (7 + 5^3)\
= |1/2(7+125)| = | 1/2(132)| = 66
That was the FIRST answer I gave: 99.95 gm
School year is ending for a lot of folks...PLUS it is the weekend....less to do or question about.
Just substitute t = 4 into the equation to get (I think your equation is REALLY 100(.99988)^t
100 (.99988)^4 = 99.952 gm after 4 years =99.95 gm (rounded to the nearest hundredth)
99.95/100 x 100% = 99.95 % remains
- (1/9)^3 = - (1/9 x 1/9 x 1/9) = -1/729
ALSO (-1/9) ^3 = (-1/9) x (-1/9) x (-1/9) = - 1/729
