How many cubes with side lengths of 1/4 does it take to fill this prism?

How to simply and write the answer n a whole number

See attachment below and find the equivalent of tan(∠qsr)

Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m? -15m = -4m -7m - 8 = m - 4 -3m - 8 = 4 - m m - 4 = -7m - 8 -8 - 7m = -4 + m -8 - 3m = 4 - m