Abird flies at 22 1/2 feet above sea level. a fish swims 6 1/2 feet below sea level. what is the difference in their elevation

4th option is correct xy=-10

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step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value