7v-v=12 subtract v from 7v to get 6v
6v=12 divide 12 by 6 to find variable
v=2
Answer:

Step-by-step explanation:
If we draw a right triangle, it would have legs 6 and 2.
Answer: rate brainliest pls
Step-by-step explanation:
THe problem is basically telling us: 
where P is the power disappated and V^2 is our voltage squared.

So, for the second example to find the power we simply have to plug k and our voltage back in, so:
Answer:
The third image
Step-by-step explanation:
Your mom