Whats -2 - 19t if t=-1

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%