Awoman deposit $100 into her son saving account on his first birthday on his second birthday she deposits $125 and $150 on his third birthday and so on. a) how much money what you deposit into her sons account on his 17th birthday b) how much in total would she have deposited after her son's 17th birthday

So a woman deposit $100 for his Son’s first birthday, then added 125$ on his second birthday and 150$ on his 3rd birthday.
We need to find the amount she deposit on her son’s 17 birthday.
And then the total amount she deposit in all.
Notice that every year her deposit increase into 25$
=> $100 + 25x (where x is the number of his son’s age)
=> 100 + 25(16) additional 16 years to get 17
=>  100 + 400
=> $500
Thus, on his 17th birthday, a woman deposit $400 and he got $500 in all.