Estimation is useful for tipping when you’re dining out, too. If the service is good, 20% of the overall bill is a nice tip to leave. Here’s a clever way to find that: move the decimal of the total amount one place to the left: that gives you 10%. Round this value to the nearest dollar and double the amount, and voila! Twenty percent. Use this to find a reasonable tip for good service on each bill. a. $31.45 b. $129.80
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
Estimation is useful for tipping when you’re dining out, too. If the service is good, 20% of the overall bill is a nice tip to leave. Here’s a clever way to find that: move the decimal of the total amount one place to the left: that gives you 10%. Round this value to the nearest dollar and double the amount, and voila! Twenty percent. Use this to find a reasonable tip for good service on each bill.
a. $31.45
b. $129.80
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