<span>An expression of more than two algebraic terms, especially the sum of several terms that contain different powers of the same variable(s).
Source: Google's definition
</span>
If you're talking about #3, then the equation would be 10+12.50h=5+15h.
h will equal 2, and the cost for that number of hours would then be $35.
20/100
= 0.2
0.2 x 20
= 4
4 of the shops are ice cream shops.
Should be a scale factor of y= 1/9