The sunflower grew at a rate of 0.6 feet per week, which is closer to Rachael's prediction of 0.4 feet per week. Therefore, Rachael's prediction was more accurate.
To solve this problem, we have to find the rate at which the sunflower grows in a week. The rate was given as 4 1/2 feet in 7 1/2 weeks. When we divide 4.5 feet (the total growth) by 7.5 weeks (the total time), we get a weekly growth rate of 0.6 feet.
Comparing this with the predictions made by Rachael and Theodore, we can see that the sunflower grew at a rate closer to Rachael's prediction of 2/5 feet per week, which is equivalent to 0.4 feet per week. Therefore, the statement-making Rachael's prediction correct is the accurate one.
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