Answer:
2500
Step-by-step explanation:
solve brackets first
30+20=50
now multiply 50 × 50 (out of the brackets )
50 × 50 = 2500
y =8.7
y + 8.5 = 17.2
Subtract 8.5 from each side
y +8.5-8.5 = 17.2 -8.5
