Step-by-step explanation:
x^2 + 10x = -25
x^2 + 10x + 25 = 0
（x+5)^2=0
x=－5
Answer:
24/35 or 0.6857142
21 Students
7:3
7*7=49
3*7=21
49:21
8.24+6.62=14.86
