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Solve the problem.Martha can rake the leaves in her yard in 7 hours. Her brother can do the job in 4 hours. How long will it take them to do the job working together?

Find an equation of the line satisfying the following conditions. If possible, write the equation in slope-intercept form. Horizontal, passing through (-8, 6)

Find an equation of the line satisfying the following conditions. If possible, write the equation in slope-intercept form. Vertical, passing through (9, 3)

Determine the x- and y-intercepts on the graph of the equation.y = -7x – 1

What is the electron configuration of Si 4+?

Compute the linear density for Silver (FCC) in the [111] direction. The atomic radius of Silver is 0.1445nm

Calculate the energy (in Joule) of attraction between a cation with a valence of +2 and an anion with a valence of -3, the centers of which are separated by a distance of 4.0 nm

Which of the following bonds are the only primary bonds that are directionally dependent?

Calculate the planar density of (100) in BCC Chromium. The atomic radius of Cr is 0.130 nm.

Calculate the density (g/cm3) of a polymer having 31.2% crystallinity. The density of fully crystalline and fully amorphous polymer is 1.450 g/cm3 and 1.300 g/cm3 , respectively.