25/5 would be 5
and in the inequality, it says the d/5 is greater than 28
d=25 is nor a solution to the in equality
2 and 4 because they all multiply and add up to 12 and 20
When you multiply a same number but with different powers, you can simply add the powers together. So, in your question, add the powers -1 and -7 together.
7^(-1) x 7^(-7) = 7^(-8)
When you divide a same number but with different powers, you subtract the power at the top with the power from the denominator. So, -8 - (-7) = -1.
7^(-8) / 7^(-7) = 7^(-1)
So your answer would be 7^(-1).
Hopefully my explanation was clear?
The correct answer is C (-20) let me know if you want to know how I got that answer
