Answer:
help me i have -30 points
Step-by-step explanation:
 
        
             
        
        
        
48 girls are there. Given that there is a ratio of boys to girls of 7:8. Then divide 42 boys by 7 boys which equals 6. After, multiply 6 by 8 girls equals 48 girls.
        
             
        
        
        
Answer:

Step-by-step explanation:
apply exponent rule:

 
        
             
        
        
        
45 degrees, you are cutting the right angle in half
        
                    
             
        
        
        
What vectors? do you have more info?