a)
[tex]2 ^{9} \times 2 ^{11} = 2 ^{9 + 11} = 2 ^{20} [/tex]
b)
[tex]5 ^{3} \times 5 ^{12} = 5 ^{3 + 12} = {5}^{15} [/tex]
c)
[tex] {7}^{19} \div {7}^{11} = {7}^{19 - 11} = {7}^{8} [/tex]
d)
[tex] {3}^{23} \div {3}^{12} = {3}^{23 - 12} = {3}^{11} [/tex]
e)
[tex] ({2}^{9} )^{11} = {2}^{9 \times 11} = {2}^{99} [/tex]
f)
[tex] ({5}^{3})^{7} = {5}^{3\times 7} = {5}^{21} [/tex]
g)
[tex] {2}^{9} \times {3}^{9} = {(2 \times 3)}^{9} = {6}^{9} [/tex]
h)
[tex] {7}^{12} \times {2}^{12} = ( {7 \times 2)}^{12} = {14}^{12} [/tex]
i)
[tex] {12}^{9} \times {4}^{9} = ({12 \times 4) }^{9} = {48}^{9} [/tex]
j)
[tex] {24}^{11} \times {8}^{11} = ( {24\times 8)}^{11} = {192}^{11} [/tex]
