Question

Can someone help me with these real quick?

1) write 13%20 as a decimal
2) write 7•7•7•7•7 in exponential form
3) *picture is attached

Answer 1

`1)\\p\%=(p)/(100)\\\\13\%=(13)/(100)=0.13\\\\13\%\ of\ 20\ is\ 0.13\cdot20=2.6\\\\2)\\\underbrace{7\cdot7\cdot7\cdot7\cdot7}_(5)=7^5\\\\3)\\Use:\\a^n\cdot a^m=a^(n+m)\\\\(a^n)/(a^m)=a^(n-m)\\\\12.\ 6^2\cdot6^(-4)=6^(2+(-4))=6^(2-4)=6^(-2)\\\\13.\ 2^(-3)\cdot2^(-2)=2^(-3+(-2))=2^(-5)\\\\14.\ (4^4)/(4^2)=4^(4-2)=4^2}\\\\15.\ (8^3)/(8^(-2))=8^(3-(-2))=8^(3+2)=8^5`