I think just the "possible" ones, without fully factoring, are based on factors of the last whole number-- +20.
So factors of 20: 1, 2, 4, 5, 10, 20
Answer:
-5+12=7
Step-by-step explanation:
the second option is adding two negatives, which sums up to -17 rather than -7
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The two triangles with the given perimeter is attached .
Perimeter is the sum of all sides.
For the first triangle , sies are 2a,2a and b.
So the perimeter is

For the second triangle, sides are a,a, and 2a+b. Therefore perimeter is

So for both triangles, perimeter is

8f - 25 = 47. Add 25 to both sides.
8f = 72. Divide each side by 8.
f = 9.