1. The ratio of the measures of two complementary angles is 4 to 5. The smallest measure is increased by 10%. By what percent must the larger measure be decreased so that the two angles remain complementary?

2. The average of the three numbers x, y, and z is equal to twice the average of y and z. What is the value of x in terms of y and z?

3. Given that -3 <= x <= 2 and 20x^2 = y - 24, what is the smallest possible value for y?