A bag contains red marbles and white marbles,23 in total. The number of white marbles is 2 less than 4 times the number of red marbles. How many white marbles are there? How many red marbles are there?

there are 18 white  marbles and 5 red marbles

Step-by-step explanation:

total # of marbles = 23

white marbles = 4r - 2

red marbles = r

4r -2 + r = 23

5r - 2 = 23

    +2     +2

5r = 25

5      5

r = 5

white marbles = 4r - 2

4(5) - 2

20 - 2

18

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)