What is the rate of change of the average height of the trees

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.