Answer:
11. 26
12. 111
Step-by-step explanation:
_____________
11:
since diagonal are equal of rectangle
QS=RT
4x+6=6x-4
6+4=6x-4x
2x=10
x=10/2
x=5
now
diagonal :4x+6=4*5+6=26
12.
again
9x+12=11x-10
12+10=11x-9x
2x=22
x=11
diagonal=9*11+12=99+12=111
