Simplify each mathematical expression 2(7y − 3) + (5y + 2) − (9y − 4)

 10y

Step-by-step explanation:

2(7y-3) +(5y+2) -(9y-4)  Apply the distributive property.

14y - 6 + 5y + 2 - 9y + 4   Combine like terms  

(14y+5y-9y) + (-6+2+4)

10y  

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answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.