The size of a certain cell is 2.5 x 10^-9 m. Another cell is 1.5 x 10^3 times larger. How large is the larger cell in scientific notation?

A.) 4 x 10^-27m

B.) 4 x 10^-12m

C.) 3.75 x 10^6m

D. 3.75 x 10^-6m

I honestly have no idea what to do.

What is |88| - in absolute value and opposite integers?

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Choose the smallest set of which {5,2,23} is a subset