Let
x = velocity of the water current
t1 = time taken to go downstream
t2 = time taken to go upstream
t1 + t2 = 8
t2 = 8 – t1
v = D/t
Downstream
(4 + x) = 6/ t1
t1 = 6/(4+x)
Upstream
(4 – x) = 6/t2
Substitute expression for t2 to obtain
(4 – x) = 6/ (8-t1)
Substituting the expression of t1 to make a single variable equation, obtaining
6 = (4-x)*(8 – 6/(4+x))
Solving for x,
x= 3.16 m/s
Answer:

Step-by-step explanation
Let w represent the number of workbooks
Let d represent the number of dry erase boards
Then , we can create the inequality for this situation

90
900/10= 90
so the answer is 90
Answer:
6
Step-by-step explanation:
im not entirely sure but i did try hope it's right lmk
Step-by-step explanation:
The given figure can be broken into three parts i.e. a triangle, and two rectangles as shown in the figure.
The base and height of triangle is 15 and 7 in. respectively
For II shape, length and width are 8 and 2 in. respectively
For III shape, length and width are 10 and 9 in. respectively.