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yulyashka [42]
3 years ago
10

The rate for mailing an envelope is $0.80 per ounce. Choose a function rule that represents the total cost, c(w), to mail an env

elope weighing w ounces. How much will it cost to mail an envelope that weighs 5 ounces?
Mathematics
2 answers:
ANTONII [103]3 years ago
8 0

Answer:   c(w)  = 0.80 w       and  the cost of 5 ounces is $4

Step-by-step explanation:

To solve this we can simply use proportionality

from the question,

$0.80    =     1   ounce

c(w)         =     w

cross multiply

c(w)   =  $0.80 w

Therefore a function rule that represents  the  cost c(w)   is $0.80 w

For the second part of the question, we are to find the cost of an envelope that weighs 5 ounce

we have different way of doing this, the first of which is to just use our function rule;

c(w)   =  $0.80 w

we substitute w=  5 into the function. Hence;

c(5)   =   $0.80 × 5   =   $4

OR

We can use a longer method;

let x = the cost of 5 ounces

$0.80   =   1   ounce

  x         =    5 ounces

cross multi[ply

x =   $0.80   ×   5  =    $4

Therefore, the  cost of mailing an envelope that weighs 5 ounces is $4.  

lana66690 [7]3 years ago
7 0
$0.80 per ounce.

for w ounces, cost will be:  0.80*w = 0.80w

Therefore c(w) = 0.80w

The cost for 5 ounces = 0.80*5 = 4.00

Cost for 5 ounces = $4.00

Hope this helps.
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