Answer:
Collin is 37.5 and Sara is 47.5
Step-by-step explanation:
s+c=85
c+10=s
(c+10)+c=85
2c+10=85
2c=75
c=37.5
s+(37.5)=85
s=47.5
4x4-12x2+9=0
Two solutions were found :
x = ±√ 1.500 = ± 1.22474