The first is either b or c and the second is d. Sorry for not telling yoi what the answer is for the first one
X represents the amount of materials she buys.
Isn't 2,351 the standardized form already?
there is word form: two thousand, three hundred fifty one
there is expanded form: (2* 1000)+ (3*100)+ (5* 10)+ (1* 1)= 2,351
