I'm confused on how to solve the triangle. can someone me ?

b = 10.28542658

Step-by-step explanation:

This is a right triangle, so we can use the Pythagorean theorem

a^2 +b^2 =c^2

The legs are a and b and the hypotenuse is c

We know one of the legs and the hypotenuse

3.9^2 + b^2 = 11^2

15.21 + b^2 = 121

Subtract 15.21 from each side

15.21-15.21 + b^2 = 121-15.21

b^2 = 105.79

Take the square root of each side

sqrt(b^2) = sqrt(105.79)

b = 10.28542658

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step-by-step explanation: