Answer:
[tex]a. \: {7}^{10} \\ b. \: {7}^{4} \\ c. \: {7}^{21} [/tex]
Step-by-step explanation:
[tex]a. \: \: {7}^{7} \times {7}^{3} \\ {7}^{7 + 3} = {7}^{10} [/tex]
[tex]b. \: \: {7}^{7} \div {7}^{3} \\ {7}^{7 - 3} = {7}^{4} [/tex]
[tex]c. \: \: { ({7}^{7}) }^{3} \\ {7}^{7 \times 3} = {7}^{21} [/tex]
