X=
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the given triangle is an equilateral triangle in which all sides and all angles are equal so,

by angle sum property of triangle

let the angles be x

then,,

x+x+x=180

3x=180

x=60°

x=60°

Step-by-step explanation:

Equilateral and Equilangular triangles always have equal angles. Since the angles of a triangle have to always add up to 180°, all of the angles of both of these triangles, including x, have to be 60; There are 3 angles in a triangle. If all the angles are equal and they must add up to 180°, then the angles must be equal to 180 if they are multiplied by 3. Because 3×60=180, All angles are 60° and therefore x=60. The lines through the sides of the triangles represent that they are equilateral triangles.

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

answer:

f(5/2) = 10/3

i hope this you!