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 Question from Shaunice, a student: Simplify each of the following expressions and determine what the last digit would be. a. (24^15) 4

Hi Shaunice,

Is that $\left(24^{15}\right) \times 4$ or $\left(24^{15}\right)^4?$ If it's the latter then

$\left(24^{15}\right)^4 = \left(24^{15}\right) \times \left(24^{15}\right) \times \left(24^{15}\right) \times \left(24^{15}\right)= 24^{60}.$

In either case you need to find the units digit of a power of 24. For this have a look at a response I gave to Alex's similar question. Write back if you need further assistance.

Penny

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