Which system of equations is represented by the matrix below? {-4 0|7}
{3 5|9}

A. -4x=7
3x + 5y = -9

B. -4x=7
5x + 3y = -9

C. -4y = 7
3y + 5x = -9

Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25