Answer:
5 13\17
Step-by-step explanation:
15-9+20/(5 x 17)
15-9+(20/85)
15-9+{4\17}
15-9{4\17}
________
4) y²-1=48
y²=49
y=±7
option C -7 and 7
5) x²=289
x=±17
-17 and 17
0.0543
(i am not fully sure)