Mei puts 600.00 in an account to use for school expenses . the account earns 10% interest , compound quarterly. how much interest will he have earned after 6 years

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How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.