Okay this one is easy all you gotta do is look at the decimal point and the place its at.
        
             
        
        
        
Explanation
to solve this we need to translate into math terms, so
Step 1
a) let d represents the number of dimes
 let n represents the number of nickles
so
re write the expressions

The number of nickels is three more than seven times the number of dimes in other words you have to add 7 to seven times the number of dimes to obtain the number of nickles
hence

therefore , the expression for the number of nickles is

I hope this helps you 
 
        
             
        
        
        
Answer:
y=2x+3
Step-by-step explanation:
Y is the total amount that the family pays. 2x represents 2 dollars for every person (so, 2 multiplied by the number of people). Finally, 3 represents the initial amount that they must pay, no matter how many are in the car.