If the radius of circle D is 5, find AB. Round your answer to the nearest tenth.
6.8
7.7
8.1
8.6

The answer is option 2.

Step-by-step explanation:

Using Cosine Rule, c² = a²+b²-2(a)(b)cosθ where a,b and c represents the side length :

Let a = AD = 5 units (radius),

Let b = BD = 5 units (radius),

Let c = AB,

Let θ = 100°,

c² = 5² + 5² - 2(5)(5)cos 100°

c² = 50 - 50cos 100°

c² = 58.68

c = √58.68

= 7.7 units (near. tenth)

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

the answer is $42.96

step-by-step explanation: