Which statement best explains why the value of this expression is equal to -8 1/2 y?
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For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Could someone me with this question i’ve been stuck on it for 20 minutes

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree