Answer:
£70.00
Step-by-step explanation:
You basically want to find what she spent in total, then subtract the amount she spent on ingredients. 
50 glasses of lemonade at £2.10 each would be £105. (50*2.1)
Subtract the cost of ingredients, which is £35, with the total she made, £105, to get £70 (105-35)
 
        
             
        
        
        
Answer:   
 
Step-by-step explanation:
We know the property of derivative: 
Given function : 
Differentiate both sides with respect to x , we get
 
  [By Chain rule]
  [By Chain rule]
 
[Since  , where a is scalar and
 , where a is scalar and  ]
]
 
Hence, the derivative of the given function is  .
 .
 
        
             
        
        
        
Answer:b 
Step-by-step explanation:y=2x-3
 
        
             
        
        
        
Answer:
w=7.
Step-by-step explanation:
Divide 7 on both sides of the equation.