Answer:
$1.84
Step-by-step explanation:
In a certain country, a letter upto 1 ounce requires postage of = $0.42
and each additional ounce (or fraction of an ounce) has an additional cost.
The function which represents this situation :
[tex]f(c)=[0.42+0.20(x-1)][/tex]
The weight of Josiah's first letter = 2.9 ounces (x= 2.9)
[tex]f(1)=[0.42+0.20(2.9-1)][/tex]
[tex]f(1)=0.42+0.20(1.9)[/tex]
[tex]f(1)=0.42+0.38[/tex]
f(1) = 0.80
[tex]f(2)=[0.42+0.20(4.1-1)][/tex]
[tex]f(2)=0.42+0.20(3.1)[/tex]
[tex]f(2)=0.42+0.62[/tex]
f(2) = 1.04
0.80 + 1.04 = $1.84
The total amount is $1.84, Josiah can expect to pay for postage
