S = the son's age
f = the father's age
In three years ,the sum of their ages will be 52.
(s + 3) + (f + 3) = 52
The age of a father is 2 less than 7 times the age of his son.
<span>7s - 2 = f
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Answer:
The selling price of sandals is: $32.77
Step-by-step explanation:
Mark up is the price that is added to the cost price of a product for profit.
Given
Price of sandals = $22.60
Mark up = 45%
To find the price with mark up, we will find the amount of mark up and then add it to the cost price of sandals.

The mark up is $10.17
Now,

Hence,
The selling price of sandals is: $32.77
if you mean what is half of 85, it's 42.5
-6/7
Negative six over seven
The Answer Would Be 3/7
Hope This Helps :)