You need to add a picture in order for others to understand what you are referring to.
Answer:
the common difference is +5
Step-by-step explanation:
10-5=5
15-10=5
etc.
goes up by 5 every term so the common difference is 5 or +5
The question is asking 15+2*9=? so to do this first multiply 2*9 which = 18 and then add 15, 18+15= 33
Answer:
$2.65
Step-by-step explanation:
to get a weighted mean
divide the total revenue by the number of books
Revenue
(1.55 * 40) + (4.85 * 20)
$159
weighted mean
159/60
$2.65
