An electrician changes a $40 fee to make a house call plus an hourly rate for labor if the total bill for a job that takes 2 hours comes too $99, what is the electrician'a hourly labor rate ?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?