Imagine math pls help 40 points

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

What is the arc length of the subtending arc for an angle of 72 degrees on a circle of radius 4? o a. 8a oc. 16 t d. 8