Squares have all equal sides so 10x4=40 40 ft is the answer
Answer:

Step-by-step explanation:
1 Subtract z from both sides.

2 Divide both sides by y

3 Switch sides.

2nd question
Answer: 
Step-by-step explanation:
1 Subtract h from both sides

2 Multiply both sides by j.

3 Divide both sides by k−h.

4 Switch sides.

Volume = base area x height
Base area = 6 (1/2 x 3 x 2.6) = 23.4 cm²
Volume = 23.4 x 7 = 164 cm³ (nearest wole number)
Answer: Volume = 164 cm³