The endpoints of the longest chord on a circle are (4,5.5) and (4, 10.5).
the center of the circle is at the point
units. the equation of this circle in standard form is

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Which one ? is the answer and how to find this answer

Awavelength of 610 nm was found to be the most intense wavelength emitted by copper. answer the following questions about this wavelength of light. a) what is this wavelength in cm? b) what is the frequency that corresponds to this wavelength? c) what is the energy of light of this wavelength? d) what is the wavenumber corresponding to this wavelength?