There are 7 classes. There are 5 groups in each class. Each group has 4 boys. Which equation shows B, the total number of boys? A. 7 + 5 + 4 = B
B. 7 x 5 x 4 = B
C. (7 x 5) + 4 = B
D. 7 + (5 x 4) = B

D

Step-by-step explanation: This is because when solving this 2 step problem, The overall topic goes out the parentheses. So, You can automatically take out " C ". Also, when you do 2 step problems there is always going to be 2 operations. So, you wouldn't even have to do the math. It's common sense the only one showing 2 operations and have the " 7 " out is " D " So you may eliminate all the other answer choices. :

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|

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