[tex]\displaystyle\bf\\a_{1} =-15\\\\d=3,7\\\\\\a_{5}=a_{1} +4d=-15+4\cdot 3,7=-15+14,8=-0,2\\\\\\a_{101}=a_{1} +100d=-15+100\cdot 3,7=-15+370=355\\\\\\Otvet \ : \ a_{5} =-0,2 \ \ \ ; \ \ \ a_{101} =355[/tex]