Try this option:
1. the sides of the biggest triangle are 16; x and √(16²-x²); the sides of the smallest triange are x;5 and y. The smallest triangle ~ the biggest triangle. Using the property of the similar triangles:

2. according to the Pyphagorean theorem (in the smallest triangle):

answer: y=√55.
It would be the first answer. Bubble. I don't know what you call it. But yeah, it's the first one.
Answer:
32 square units
Step-by-step explanation:
Ok this is a linear equation that is descending and is in slope intercept form