Question

help
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Answer 1

can you tell me is the answer is right

Answer 2

yes, but it would be nice to do the arithmetic so we can see we don't get the same # on both sides of the = sign

Answer 3

Your answer is correct. However, we know about your picky teacher so I would say:
A radius is perpendicular to a tangent at the point of tangency. So if AB is a tangent, it must be true that AOB is a right triangle and so the sum of the squares of the legs must equal the square of the hypotenuse.
7^2+3.75^2= 49+14.0625=63.0625
8^2= 64
Since 63.0625 is not equal to 64 AB is not a tangent.

Answer 4

mertz from where did we get 49

Answer 5

AB = 7 is given

Answer 6

yep thanks