Answer:
Alex is buying margin
Explanation:
given data
needed to buy shares = $10,000
Alex have = $7000
to find out
Alex is
solution
we know that here alex have $7000 but he not entire $10,000
so as buying on margin is borrowing money by broker in order to purchase stocks
and it is like loan from the brokerage so here margin trading allow the investor to buy more stocks than they able to normal
so we can say Alex is buying margin