pls nswer correctly and don't leave links or blank answers. I need it step by step and it is very important. I will be marking as brainliest. thank you so much​

a) ±3 b) ±18

Step-by-step explanation:

a) x^2+1/x^2=7

Add 2 both sides to complete the squares

x^2+1/x^2+2=7+2

(x+1/x)^2=9

(x+1/x)=±3

b) (x+1/x)=±3

Cubing both sides, we have

x^3+1/x^3+3(x*1/x)*(x+1/x)=±27

x^3+1/x^3+3*±3=±27

x^3+1/x^3=±18

5

step-by-step explanation:

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation: