In a standard deck of 52 cards, there are four 8's and four queens. The probability of picking an eight is 4/52 or 1/13. Furthermore, the probability of picking a queen from the deck is also 1/13. Since the problem asked for the probability of picking either eight or queen, add the probability of picking queen and eight. The addition gives 2/13. 
Thus, the answer is 2/13. 
        
             
        
        
        
First find the area of the triangle (on top) and then subtract the area of the circle (on bottom) since the triangle is Equilateral, you can assume that the height can be found by using the 30 60 90 angle relationship. To find the radius of the circle, divide the height by 2.
 
        
                    
             
        
        
        
Answer: cardiac output=11,250ml/min
Step-by-step explanation: Cardiac output = Heart rate(beats/min) × stokes volume (ml/beat)
Cardiac output = 125 ×(130 -40)
Cardiac output= 125×90 =11,250ml/min
 
        
             
        
        
        
Answer:
6 schedules 
Step-by-step explanation:
First, decide if this situation describes a combination or a permutation by looking at the significance of order. Consider a specific example where the letters A – C represent the 3 different pitchers. The pitching order A, B, C is different from the pitching order B, C, A because the players will be pitching at different times. Therefore, this situation describes a permutation. Use the formula for finding the number of permutations when the number of pitchers is 3, so n = 3, and all 3 are taken at a time, so r = 3 as well.