Atriangle has sides with lengths: 6, 9, and 5. how do you find the area of the triangle using heron's formula?

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site

True or false? the sum of the differences (% - 7) is never zero for any distribution consisting of n observations.