Tom receive an allowance of 20 dollars per week if he bought 3 comic books for 2.75 dollars each and an action figure for 10.99dollors how much of his allowance did he have left

20 - (3 * 2.75) - 10.99

20 - 8.25 -  10.99

12.75 - 10.99

1.76

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

17.08

correct me if i am wrong.