Sandy programmed a website's checkout process with an equation to calculate the amount customers will be charged when they download so. The website offers a discount. If one song is brought at the full price of $1.29, then each additional song is 99 cent State an equation that represents the cost, f(×) and when X songs are downloaded ​

f(x) = 0.99x + 0.3

Step-by-step explanation:

f(x) = 1.29 + 0.99(x - 1)

Distribute

f(x) = 1.29 + 0.99x - 0.99

Combine like terms

f(x) = 0.99x + 0.3

a = 11 : 4

b = 38

c = 1 for every 6

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is