Please answer the questions with neatly work shown

Determine if the three sides given represent a right triangle. 7. 1, 2, 3 8. 15, 36, 39 9. Which group of three side lengths could form a right triangle? A. 5 ft, 12 ft, 13 ft B. 7 ft, 11 ft, 14 ft C. 15 ft, 20 ft, 22 ft D. 18 ft, 34 ft, 39 ft 10. A ladder is leaning up against a house. The foot of the ladder is 2.5 feet from the house. The ladder is 8 feet long. How far up the side of the house does it reach? (Hint: Draw a picture!) 11. Mr. Malone plans to construct a walkway through his rectangular garden, as shown in the drawing. What is the approximate value of w? Round to the nearest whole number! 110 10 ft