Use circle o to for exercises 6-8 (i need the answers for 7 & 8) 7. ob = 28 squared. what is the radius? 8. what is the value of x? quickest correct answer to both is my literal hero

See  the attached picture with letters to better understand the problem

Part 8) 
we know that
The angle bisectors of a triangle intersect in a point (incenter) that is equidistant from the three sides of the triangle
so
OF=OD=OE-----> are the radii of the inscribed circle

the triangle ODB and the triangle OBE are congruent
so

applying the Pythagoras Theorem
OB²=OD²+DB²------> solve for OD
OD²=OB²-DB²------> (√28)²-5²-----> OD²=28-25-----> OD=√3 units

radius is equal to OD
therefore

the answer part 8) is
radius is √3 units

Part 9) What is the value of x? 

we know that
in the quadrilateral FOEC the sum of the internal angles must be equal to 360 degrees
so
360=90+90+60+x
x=360-240
x=120°

the answer Part 8)  is
x=120°