Answer:
B) 15x = y
A) D: {0 ≤ x ≤ 12}
D) 6.5%; $22.10
Step-by-step explanation:
1)
We know that Susan earned $180 and worked for 12 hours. We need to divide those number to find the ratio of change of the variables
[tex]r=\frac{180}{12}= 15[/tex]
This means Susan earn $15 per hour. The expression that models this is
[tex]y=15x[/tex], because it shows the constant ratio of change, that is, the monery earned per hour.
Therefore, the right answer of the first question is B).
2)
Remember, when wa talk about domains, it refers to x-values or horizonta axis values.
Notice in the graph that x-values goes from 0 to 12. That means the domain is a set which contains all values from 0 to 12.
Therefore, the right answer of the second question is A) D: {0 ≤ x ≤ 12}.
3)
We know that Anna pays $3.90 sales tax on a $60 purchase. To know tha rate of sales tax we just need to divide
[tex]\frac{3.90}{60}= 0.065 (6.5 \%)[/tex]
Observe that the only choice that has 6.5% of sales tax is D, so that's the right answer.
However, let's find the sales tax on a $340, purchase
[tex]0.065(340)=22.10[/tex]
That means the salex tax is $22.10.
