Answer:
D
Step-by-step explanation:
given
4.2(3.9r - 5.9s) + 7.9s - 9.53r ( distribute parenthesis by 4.2 )
= 16.38r - 24.78s + 7.9s - 9.53r ( collect like terms )
= (16.38r - 9.53r ) + (- 24.78s + 7.9s )
= 6.85r + (- 16.88s ) = 6.85r - 16.88s → D
