Mark has a $100 gift card to buy apps for his smartphone. Each week, he buys one new
app for $4.99.
1. Write an equation that relates the amount left
on the card, y, over time, x.

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Explain why the factor 1.5 is broke. into two numbers in the model.