Help pls this is due in ten minutes

How do you write something in scientific notation?

Which equation shows the variable terms isolated on one side and the constant terms isolated on the other side for the equation -1/2x+3=4-1/4x? a. -1/4x=1 b. -3/4x=1 c. 7=1/4x d. 7=3/4x

Find the amplitude of a sinusoidal function that models this temperature variation