Which equation can not be used to find the area of a triangle

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Find the missing dimension! need asap! tiny square is a =3025 in ²

Mr. t has been dating his girlfriend for one year nine months and six days how many hours has mr. t been in a relationship