If johnny has four apples and he eats 7 how many apples does he have left over

The product of two negative rational numbers is always zero sometimes zero never zero

Select true or false to tell whether the following conditional p q is true or false. use the truth table if needed. if a week has seven days, then a year has twenty months.

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?