Final answer:
mT in the kite RSTU is equal to 140.
Step-by-step explanation:
To find mT in the given kite RSTU, we need to use the property of a kite which states that the opposite angles are congruent (equal in measure). In this case, mR=140 and ms=80. Since mR is opposite to mT, we can set up the equation: mR = mT. Therefore, mT = 140.