Celine puts into an investment account. The value of the investment grows exponentially, doubling every 20 years. Which equation can be used to find the number of years it takes Celine's investment to gain in value?
$
750
y
,$
900
750
(
y
)
1
20
=
900
750
(
2
)
y
20
=
1,650
750
(
2
)
y
20
=
900
900
(
2
)
y
2
=
750
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