State if each graph is continuous or discrete. then state whether it is a function

Step-by-step explanation:

Discrete data can only have certain values.  For example, if you roll a die, there are only 6 numbers you can get.  Continuous data can have any value within a range.

Graphically, discrete data will appear as only points, where as continuous data appears as a line or curve.

So the top left and bottom right graphs are discrete.  The top right and bottom left graphs are continuous.

To be a function, each x value can only have 1 y value.  Graphically, we can check this using the "vertical line method".  Imagine a vertical line (or use a ruler or straight edge) and move it from left to right.  If it ever crosses the graph in two or more places, the graph is not a function.

Therefore, the graphs on the left are not functions, and the graphs on the right are functions.

y=mx+b

step-by-step explanation:

m is slope, b is y-intercept

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40