Stephen earns $11 per hour at his job. Last month, Stephen worked for 32 hours. On his paycheck, Stephen noticed that he paid $37.30 for federal income tax, $21.82 for Social Security, and $5.10 for Medicare.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?