
We have the vertex (-4, -1), therefore we have:

Number of biscuits shared by Mrs Perry = 25
ratio in which the biscuits were shared between Gemma and Zak = 1:4
Let us assume the common ratio = x
then
x + 4x = 15
5x = 15
x = 3
Then
The number of biscuits that Gemma got = 3
The number of biscuits that Zak got = 4x
= 4 * 3
= 12
So
Gemma: Zak = 3:12
I hope the procedure is clear enough for you to understand.
domain of the problem is -5 and the range is 4
Let s represent the sandwich and p represent the portion
<span>s=8p</span>
2x squared +1 (-)x squared -7 is
a.) x squared +8