Step-by-step explanation:
a)
DA is tangent and at point A and OA is radius of the circle.
(Angle formed at the circumference of the circle is half the angle formed at the center of the circle)

Idk if this is right or not but I got 44%, if this is wrong I’m very sorry :(
-1.5(4-n)+2.8
multiply 4-n by -1.5
multiply to both the 4 and -n
-6+1.5n+2.8
add -6+2.8 since they are similar
-3.2+1.5n
1.5n-3.2
I believe this is the simplest form
2 is subtracted from 8 which gives you 6 and 6 times 5 equals 30
Step-by-step explanation:
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