21n+14 you have to find the value of n
Focus on triangles DFC and DFE:
- They are both right triangles because DF is perpendicular to EC
So, the two triangles are congruent. It follows that CF=FE, and in particular

And since x=3, the length of EF is

its y-axis for the first answer and the other one its, y=-x
No they aren't because they both can't be multiple by the same number
The amount of water that fills up the tub !