Describe the expression 2(m + 7) A. Two times the sum of m and seven
B. Two times m plus seven
C. The sum of 2 and m times 7

A.

Step-by-step explanation:

Order of operations, parentheses first. when it says "two times THE SUM OF " it means you need to find the sum first, which you do. you should know that in math, when a number is next to a parentheses they get multiplied, which is what happens next, and there is nothing else to be done so A is you answer.

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