8.−7.1 + (−4.3) + 7.1

Step-by-step explanation:

The vertices of the triangle are: R(2,3) , S(4,4) and T(5,0)

The triangle is RST

The sides are:

RS /ST /TR

We will work with vectors to make it easy:

Vector RS (4-2,4-3)=>(2,1)

Vector ST (5-4,0-4)=>(1,-4)

Vector TR (5-2,0-3)=>(3, -3)

Now the distances:

RS= root square( 2^2+1)= r.sq 5

ST= root square (1+4^2)= r.sq 17

TR= root square (3^2+3^2)=r.sq 18

Now part B:

Part B is about drawing