91Ó°ÊÓ

Use the diagram given for angles as shown below

If $a=b+c$ and $c>0$ then $a>c$.

As from the figure $RS+ST=RT$hence $RT>RS$.

So, the answer is Yes.

Property of sides opposite to equal angles is also equal.

Since given that $m∠RVS=m∠RSV=65$therefore from the property of sides opposite to equal angles are also equal $RV=RS$.

Since $RV=RS$and $RT>RS$ therefore $RT>RV$.

Thus, the answer is Yes.

Use the diagram given for angles as shown below

Use part (b) as shown that point $m∠RVS=m∠RSV=65$and $RV=RS$.

Since $RS+ST=RT$and $RT>RS$therefore data are insufficient for $RS>ST$

Thus, the answer is No.

If $a=b+c$ and $c>0$ then $a>c$.

Use part (b) as shown that $m∠RVS=m∠RSV=65$therefore from the property of sides opposite to equal angles are also equal $RV=RS$.

Since $RS+ST=RT$and $RT>RS$therefore data are insufficient for $VT<RS$

Thus, the answer is No.