You bought a magazine for 4$ and 4 books you spent a total of 30$ how much did each book cost

6.5

Step-by-step explanation:30-4=26

26 divided by 4 equals 6.5

$6.50

Step-by-step explanation:

You have a total of 30 dollars

The given statement is that you spent $4 on a magazine, sense we already know this information then we can eliminate the given statement from the total

30-4=26

You have 26 dollars left and must be distributed among 4 books evenly

you must divide 26 by 4

26/4 = 6.5

Each book cost $6.50

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560