Which of these strategies would eliminate a variable in the system of equations

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Find all the angles that satisfy the equation cos(θ)=32

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%