Answer:
yes Cecilia make her first mistake in step 2
True
The two shorter lengths do not add up to more than the longest length. 3+3 is less than 9. Therefore, even if the two shorter lengths lay on top of the longer side, the two ends cannot meet to form a closed 3 sided figure
(8x + 2y) - (7x + 2y) = 30 - 24
X = 6
The formula for finding the length is

All we have to do is plug in the numbers.

36 + 64 = 100
Since 100 =

we have to find the square root.

The length of the slide is 10 feet.
24 becuase add the two together then divide by two