does this graph represent a function? (may choose more than 1 answer. graph attached)

a. no, because some of the y-values are paired with two x-values
b. yes, because it touches the y-axis exactly one time
c. yes, because each x-value has exactly on corresponding y-value
d. no, because there are no closed circles to show where the graph ends

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Find the domain and range of the following function f(x) = 51x - 21+ 4