Does anyone know how to do this, i will give brainliest. just

4. Yes. The two short sides have a sum greater than the longest side.

Step-by-step explanation:

To find if a triangle can be formed with certain side lengths, use the theorem that the sum of the two shorter sides of a triangle must be greater than the longest side. For #4, the sides you are given are of length 3, 7, and 8. 8 is the longest side and 3 and 7 are the shorter sides. 3 + 7 = 10, which is greater than 8; therefore, these side lengths can form a triangle.

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13