Susan wants to save $800 to buy a tv. she saves $19 each week. the amount, a (in dollars), that she still needs after w weeks is given by the following function
a(w)=800-19w
how much money does susan still need after 5 weeks ?
if susan still needs $349, how many weeks has she been saving?

$705 after 5 weeks

23.7 WEEKS

Step-by-step explanation:

800-19(5)=705

349=800-19w subtract 800

-451=-19w divide by -19

W=23.7

The mean is found by adding up all the data points and dividing by the total number of data points. Susan is increasing the amount that she saves by $50 --since she will add $10 four times and by spending $5 less two times she is saving another $10 the mean will increase by  

50

6

since this is over a 6 week period. Therefore the correct answer is The mean will increase by approximately $8.

9 x 8 divided by (5-3)=36