[tex]a)m_{a}=(0.15 + 0.3 + 1.11) \div 3 = 1.56 \div 3 = 0.52[/tex]
[tex]b)x = 1.5 \times {10}^{3} - 0.14 \times {10}^{4} [/tex]
[tex]x = 1.5 \times 1000 - 0.14 \times 10000[/tex]
[tex]x = 1500 - 1400[/tex]
[tex]x = 100[/tex]
[tex]y = {0.3}^{2} \times 100 - 1[/tex]
[tex]y = 0.09 \times 100 - 1[/tex]
[tex]y = 9 - 1[/tex]
[tex]y = 8[/tex]
[tex]m_{a} = (x + y) \div 2[/tex]
[tex]m_{a} = (100 + 8) \div 2[/tex]
[tex]m_{a} = 108 \div 2[/tex]
[tex]m_{a} = 54[/tex]
