Michael is training for a 10 mile race. during the first week, he runs 2 miles. each week he runs one and a half times what he ran the previous week. if he only runs once a week, how many total miles has he run by the 5th week?
a) 10.13 miles
b) 15.19 miles
c) 16.25 miles
d) 26.38 miles

D) 26.38

Step-by-step explanation:

Multiply each week by 1.5 and it says total, so add all the number up to get 26.38

we need the options

step-by-step explanation:

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)