Please help ASAP I need the answer soon and I don't know what to do.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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

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.