A local bookseller carefully collects data on the customers that enter her store. She uses the term "unit" to describe either a customer that comes in alone or a group of customers that come in together. Based on past experience, she estimates that 13% of the units who enter her store will make some type of purchase. It appears that the units are independent. What is the probability that three units in a row will make a purchase? Choose the correct answer below.
A.0.13
B.0.39
C.0.002197
D.0.169

it’s the first one your welcome

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form