D. u.s. workers will lose their jobs
If you use a mixture of formats in a single document, it can be confusing to the reader. This is the exact opposite of what formatting is supposed to do.
Answer: c. Each line of the document has different formatting applied to it.
Dx/dt=3
y=3x^3-2x
dy/dt=(9x^2)(dx/dt)-2(dx/dt)
When x= -2
dy/dt=(9(-2)^2)(3)-2(3)
=36(3)-6
=102