SOLUTION: Please help me find the equation of this function problem: Assume that it costs $0.30 to mail a letter weighing one ounce or less, and then $0.27 for each additional ounce or fract

Question 104891: Please help me find the equation of this function problem: Assume that it costs $0.30 to mail a letter weighing one ounce or less, and then $0.27 for each additional ounce or fraction of an ounce. Let L(x)be the cost of mailing a letter weighing x ounces. Find L(4).
Found 2 solutions by edjones, oberobic:
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
L(4)=0.3+3*.27
=.3+.81= $1.11
Ed
Answer by oberobic(2304) (Show Source): You can put this solution on YOUR website!
Think of this as a linear equation.
y = mx + b is the general equation for a line.
We're told that for each ounce after the first ounce, the charge is 27 cents. That is the slope (m).
We're told the first oz costs 30 cents = 27+3.
y = 27x + 3
Checking at x = 1,
y = 27+3 = 30.
Checking at x = 2,
y = 27*2 + 3 = 54 + 3 = 57.
That fits the facts given.
So, apply for 4 oz:
y = 27*4 + 3 = 108+3 = 111 cents = $1.11.
RELATED QUESTIONS
Please help me find the equation of this function problem: Assume that it costs $0.30 to... (answered by edjones)
Assume it costs 25 cents to mail a letter weighing once ounce or less, and then 20 cents... (answered by stanbon)
To mail a first class letter, the U.S. Postal Service charges $0.49 for the first ounce... (answered by Theo)
Hello, I am having trouble understanding and solving this problem: To mail a first... (answered by solver91311)
Use an equation to model and solve this problem!!! the postal service charges $.32 (answered by checkley71)
In 2000, the United States Postal Service charged $0.45 to mail a letter weighing up to 3 (answered by macston)
In 2002, the price of mailing a letter was $.34 for the first ounce or part of an ounce... (answered by josmiceli)
mailing a standard sized letter in 2005 first-class mail cost 0.37 for a letter weighing... (answered by greenestamps)
In 2009 the U.S. Postal Service charged $1.17 postage for first-class mail retail flats... (answered by ikleyn)