Zachary purchased a computer for $1,900 on a payment plan. Two months after he purchased the computer, his balance was $1,630. Six months after he purchased the computer, his balance was $1,090. What is an equation that models the balance y after x months?

1800 - 1350= 450 3 months after the purchase he payed $450

450/3= $150 per month

1350 - 1050= 300 5 months AFTER THE PURCHASE he payed $300

300/2= $150 per month

^after 2 more months he payed $300^

$150 per months

Equation: (initial amount) - (150)M

M= amount of months after purchase

B = 1800 - 150M

Step-by-step explanation:

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

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