Answer:

Step-by-step explanation:
Look at the picture.
Use the Pythagorean theorem:

We have:

Substitute:

<em>multiply both sides by 4</em>
<em>subtract 81 from both sides</em>
<em>divide both sides by 4</em>

Answer:
4.4721
Step-by-step explanation:
Answer: 1.4 or 1 2/5
Reason: if you were to do 8.4÷6 you would get 1.4 and to check your work you can do 1.4×6 which is 8.4 or 8 2/5
Where is the insert image?
Answer:
11x-2y
Step-by-step explanation:
Combine like terms so 2x+9x=11x AND -4y+2y=-2y so answer follows as 11x-2y