Answer:
(300 + 50x)/(2 + x)
Step-by-step explanation:
Let the cost of teachers' edition books be t
Let the cost of students' edition books be s
So t = 150; s = 50
Then the total cost of 2 teachers' editions and x students' editions is 2t + sx = 2 × 150 + 50x = 300 + 50x.
The total number of books is 2 + x.
So the average cost per book is (300 + 50x)/(2 + x)
Answer:
I) box plot
Step-by-step explanation:
A box plot is formed by using the five-number summary. This summary includes:
Minimum; maximum; Q1 (first quartile); Q2 (median); Q3 (third quartile).
The median of the data will be the vertical line inside the box. Since it specifically shows the median, a box plot is the best choice.
The value of x, when y is 2 is 3.
Therefore, g^-1 (2) = 3
Let y = 3x - 10, then x = (y + 10)/3
Therefore, h^-1 (x) = (x + 10)/3
(h o h^-1)(x) = h(h^-1(x)) = h((x + 10)/3) = 3((x + 10)/3) - 10 = x.
Therefore, (h•h^-1)(-1) = -1