Write the simplified expression for the sum of (2x - 5y) and 4(y + x).

Step-by-step explanation:

(2x - 5y) + 4(y + x) = 2x -5y +4*y +4*x

=2x -5y + 4y + 4x

add like terms

=6x - y

6x - y

Step-by-step explanation:

Step 1:  Add

(2x - 5y) + 4(y + x)

Step 2:  Distribute

(2x - 5y) + 4(y + x)

2x - 5y + 4y + 4x

6x - y

 6x - y

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

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