measure of angle RST=5(x+1)-3

what is the question?

If ST=15 and RT=40, then RT=

To find the measure of angle RST, we need to know the value of x. Without knowing the value of x, we cannot determine the exact measure of angle RST.

To find the value of x, you need to have more information from the given problem or provide additional equations or measurements. Once you have the value of x, you can substitute it into the expression 5(x+1)-3 and compute the result to find the measure of angle RST.