How do I solve the following inequality?

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

The correlation between height and weight for a certain breed of plant is found to be 0.75. what percentage of the variability in plant weight is not explained by height? 1-0.75 = 0.25 or 25% (b) )^2 = 0.5625 or 56.25% (c) )^2 = 0.4375 or 43.75% (d) (1 - 0.75)^2 = 0.0625 or 6.25%

Find the difference in altitude of 2149 feet and a desert valley that is 184 feet below sea level