Alejandro simplified the expression 100 – [45 ÷ (15 – 10)] using the steps shown. 100 – [45 ÷ (15 – 10)] 100 – [3 – 10] 100 – [–7] 107 Which statement is true about Alejandro's work? He should have subtracted 7 instead of adding it. He should have subtracted 10 before dividing. He should have subtracted 45 before dividing. He did not make any errors.