Ab is a diameter of a circle with the center o. c is a point on the circumference of the circle, such that ∠cba = 32°. find ∠cab.
a) 28°
b) 32°
c) 58°
d) 96°

∠CAB = 58°. Therefore, The correct option is C) 58°

Step-by-step explanation:

For better understanding of the solution, see the attached figure of the problem :

In ΔCOB, OC = OB ( Radius of the same circle)

⇒ ∠OCB = ∠OBC ( Angles opposite to equal sides are equal)

Since, ∠OBC = 32°

⇒ ∠OBC = 32°

Now, Using angle sum property,

⇒ ∠OCB + ∠OBC + ∠BOC = 180°

⇒ 32° + 32° + ∠BOC = 180°

⇒ ∠BOC = 116°

Now, ∠AOC + ∠BOC = 180° ( Linear pair angles sum is supplementary)

⇒ ∠AOC = 180 - 116

⇒ ∠AOC = 64°

Now, In ΔAOC, OA = OC ( Radius of same circle)

⇒ ∠OCA = ∠OAC ( Angles opposite to equal sides are equal)

Using angles sum property,

∠OCA + ∠OAC + ∠AOC = 180°

⇒ 2∠OAC = 180 - 64

⇒ ∠OAC = 58°

Hence, ∠CAB = 58°

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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