It has to be the third option 8(1+6) because 8+48= 56 and 8(1+6)= 56
Annual interest is P*r^t, r is 0.05 here, t is 9/12=3/4=0.75
P*0.05^0.75=120
use your calculaor: P= 120÷ (0.05)^0.75=1135
so he invested about 1135 dollars
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You should divide 280 into 3 which would equal 9
First we do brackets
(8900)-(1x89)
next we do the next bracket
8900-89
now we finish the equation
8811
P(not 5) =5/6 and P(5) = 1/6
If the first 5 is rolled on the 5th roll then the first four rolls were not 5
P(5 on fifth roll) = 5/6 x 5/6 x 5/6 x 5/6 x 1/6 = 5^4/6^5 = 625/7776 = 0.080375...
