Question

Help please i need help

Answer 1

number 3

Explanation:

as if you subract the two values that should be the answer.

Answer 2

-0.71

Explanation:

Write in exponent form.

`\sqrt[a]{7^b}=7^{(b)/(a)}\\\\\\ \sqrt[4]{7^9}=7^{(9)/(4)}`

Use law of exponents to simplify the equation.

`\boxed{a^m * a^n = a^(m+n) \ and \ (a^m)/(a^n)=a^(m-n)}`

`\sf 7^{(13)/(4)}*\sqrt[a]{7^b} =7^{(2)/(7)}*\sqrt[4]{7^9}\\\\ 7^{(13)/(4)}*7^{(b)/(a)}=7^{(2)/(7)}*7^{(9)/(4)}}\\\\7^{(b)/(a)}}= \frac{ 7^{(2)/(7)}*7^{(9)/(4)} }{7^{(13)/(4)}}`

`=7^{(2)/(7)+(9)/(4)-(13)/(4)}\\\\=7^{(-5)/(7)}\\\\=7^(-0.71)`