Can you me answer this question? i’ve been really struggling with it. you so much!

x*1/10 and x*9/10

step-by-step explanation:

7)this is because she only has 1/10 of the money left

8)this is because she spent 9/10

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)