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
X intercept (3/2 , 0)
Y intercept (0, -3)
By pythagoras theorem,
cb^2 = ac^2 + ab^2
5^2 = ac^2 + 3^2
ac^2 = 5^2 - 3^2 = 16
ac = squareroot 16 = 4cm
4,2 and 8 i'm pretty sure.