The Pythagorean theorem tells you ...
... c² = a² + b²
... 13² = 12² + b² . . . . . fill in the given numbers
... 169 - 144 = b² . . . . .subtract 12²
... √25 = b . . . . . . . . . take the square root
... b = 5 . . . . . . The value of b you're looking for.
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The numbers {5, 12, 13} make what is called a "Pythagorean triple" a set of integers that satisfies the relation of the Pythagorean theorem. These, and the triple {3, 4, 5} are often seen in algebra problems. It can be worthwhile to remember these numbers.
 
        
             
        
        
        
Answer:
so x = 20 , y = -21 , which is in quad IV
r^2= 400+441 = 841
r = √841 = 29
then cos Ø = 20/29
sec Ø = 29/20 = 1.45
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There are 3 y’all in the equation
        
                    
             
        
        
        
Answer:
The correct answer is the last option (d.) 
Step-by-step explanation
 
        
                    
             
        
        
        
Hi there
The formula in this situation is
2=e^0.052t
Solve for t
T=(log(2)÷log(e))÷0.052
T=13.3 years round 13 years
Hope it helps