Calculate the difference between the cost of a used brain and an unused brain

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

Triangle with the the sides 72 and 75 and x. also other trsingle withsides 24 25 and 7. what is the value of x.

To obtain a microcredit loan, a person typically must a. be a male and have a source of income b. provide collateral and sign paperwork c. verbally promise to pay back the money d. have a good credit history select the best answer from the choices provided. a b c d