The expression x^4 - 16 is equivalent to :
(a) ( x^2 + 8 ) ( x^2 - 8)
(b) ( x^2-8) (x^2-8)
(c) ( x^2+4) ( x^2-4)
(d) (x^2-4) (x^2-4)

positive

step-by-step explanation:

the quadrant is facing upwards

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

answer: what are the following choices

the answer is c. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀