Answer:
Step-by-step explanation:  85 students and 80 adults        
 
        
             
        
        
        
Answer:
Step-by-step explanation:
b.) cos((π/2)-Ф)=-3/5 is true because : 
cos((π/2)-Ф)= sin(Ф)
 
        
             
        
        
        
Steps:
1. To do this problem, you have to divide the area by the length 
2. To make this easier, turn both numbers into improper fractions
 143/32 divided by 11/4
3. To divide you actually have to multiply by the reciprocal
143/32 times 4/11 equals 572/352
4. Turn 572/352 into a mixed number which is 1 220/352
5. Now you simplify it by dividing the numerator and denominator by 44
6. Your answer is. 
 1 5/8
        
             
        
        
        
32 units
Uhh- i just graphed the ordered points and it indeed formed a rectangle. I counted how many units are around the rectangle cus thats what perimeter is. Its 32 units
Ita not quite complicated tho. Have a nice day