Approximately 1.143 L of peroxide should be added to the original solution.
I believe there are 35 backpacks in all. 2 closets have 6 shelves all together. Then 6*5=35.
there is an equation for straight lines which goes
y-y,=m(x-x,)
where( x, , y, ) is any coordinate on the line and m is the gradient
so your answer is
y-7= -2(x-4)
does this make sense?