When adding the numbers $5.75$ and $12.4$, what is the most important first step to perform to get the correct sum?

Align the last digits, the 5 and the 4

Place a zero at the end of 5.75

Align the decimal points vertically

Add the whole numbers 5 and 12 first

When solving an inequality, under which condition must you reverse the direction of the inequality symbol?

When you subtract a negative number from both sides

When you multiply or divide both sides by a negative number

When the constant term on one side is negative

When you add a negative number to both sides