Question

Need help please and thank you

Answer 1

Using pythagorean trplet

`\\ \sf\longmapsto AC^2=AB^2+BC^2`

`\\ \sf\longmapsto AC^2=6^2+8^2`

`\\ \sf\longmapsto AC^2=36+64`

`\\ \sf\longmapsto AC^2=100`

`\\ \sf\longmapsto AC=√(100)`

`\\ \sf\longmapsto AC=10`

Answer 2

Use the Pythagorean theorem:
a^2+b^2=c^2
Let the unknown hypotenuse be x:
6^2+8^2=x^2
36+64=x^2
100=x^2
x=10
The answer is the first choice: 10