23x+12x=42
76x=42
76x÷76=42÷76
x=36.
It’s nice ___________him to treat _________ many children kindly.
A.of ; such
B.for ;such
C.of ;so
D.for ;so
A.5Hz,10A
B.50Hz,10A
C.50Hz,10 A
D.5Hz,10 A