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olga55 [171]
3 years ago
11

Help all three! this is for my friend. thanks!

Mathematics
1 answer:
Angelina_Jolie [31]3 years ago
6 0
2. answer= 720
you can put the given information into the formula ir^t = f, where i is the initial amount, r is the rate of increase, t is time (in hours) and f is the amount after the given time. So you get 90(2)^h/4 = f (the rate being twice the amount, so 2; and this rate is for 4 hours, so divide the time by 4)

3. the first answer, the second term must be 10 to the power of something.

4. <span>the first answer, it is the same reason as #3</span>
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