if we know that two sides of an isosceles triangle are 3cm and 4cm and that's its perimeter is not 10cm then what is the perimeter?

7 cm

Step-by-step explanation:

The sum of the 2 sides of a triangle is always greater than the 3rd side of the triangle.

If we take the 3rd side as 3cm then it will not satisfy the above statement i.e 3cm+3cm=6cm <7cm (sum of 2 sides is smaller than the 3rd side)

therefore, the 3rd side of a triangle will be 7cm.

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !