Answer:
the missing value is 9.33.
Step-by-step explanation:
given,
length (l) = 3x+2
breadth (b) = 4
perimeter(P) = 68 cm
now,
P = 2(l+b)
or, 68 = 2× ( 3x+2+4)
or, 68 = 2× ( 3x+ 6)
or, 68 = 6x+12
or, 68 - 12= 6x
or, 56 = 6x
or, 6x = 56
or, x = 56/6
or, x = 9.33
Answer:

Step-by-step explanation:
(smaller triangle below)

(bigger triangle above)
Since you have both triangle, and all lengths you dont need to worry about calculating the square
Add both together

Let b be the number of books in a box. Then we can say that the total number of books is equal to the number of boxes times the number of books per box.
7b=126 divide both sides by 7
b=18
So there are 18 books per box.
1,000 cubic feet because the pyramid is 4000 cubic feet on an area base of 40.
The y intercept is the y value when x is 0.
In the table when x is 0 y = 4
The y-intercept is 4
Answer: A. 4