Answer:
Step-by-step explanation:
1.
[tex][(5 + 2)3]5\\\\\mathrm{Follow\:the\:PEMDAS\:order\:of\:operations}\\\\\mathrm{Calculate\:within\:parentheses}\:\left[\left(5+2\right)3\right]\::\quad 21\\\\=21\times\:5\\\\\mathrm{Multiply\:and\:divide\:\left(left\:to\:right\right)}\:21\times\:5\:\\:\quad 105[/tex]
2.
[tex](9-2)10\\\\\mathrm{Follow\:the\:PEMDAS\:order\:of\:operations}\\\\\mathrm{Calculate\:within\:parentheses}\:\left(9-2\right)\::\quad 7\\\\= 7\times 10\\\\\mathrm{Multiply\:and\:divide\:\left(left\:to\:right\right)}\:\\7\times\:10\::\quad 70[/tex]