Answer: B √65
Explanation:
The triangle on the right is a 3-4-5 right triangle. Common triangle. You can use Pythagorean to solve for the 4
To find x your triangle is 4-7-x
Use Pythagorean to solve for x(hypotenuse)
x²=4²+7²
x² = 16 +49
x² = 65 >take square root of both sides
x = √65 >this cannot be simplified any further