Could 2.8 cm, 4.0 cm, and 2.8 cm be the side lenghts of a triangle?

We can have triangle with those sides.

Step-by-step explanation:

To check if some sides can be side lengths of triangle, every side must be less than sum of other two.

a=2.8

b=4.0

c=2.8

So, lets check.

a<b+c  2.8<6.8

b<a+c 4.0<5.6

c<a+b 2.8<6.8

We see that it is true. So 2.8;4.0 and 28 could be side lengths of triangle.

the solution is h=10 because you add 9 to each side of the equation.