Final answer:
To estimate the tip on a $36.00 bill correctly, Phillip wants to leave a 15% tip. The correct equation to estimate the tip is D. $3.60 + $1.80 = $5.40.
Step-by-step explanation:
A mathematical equation is a statement asserting the equality of two mathematical expressions. It consists of variables, constants, and mathematical operations.
To estimate the tip on a $36.00 bill correctly, Phillip wants to leave a 15% tip.
He thinks that 15% is equal to 10% plus half of 10%.
To determine the tip amount, Phillip can use the equation:
$3.60 + $1.80 = $5.40
Therefore, the correct equation to estimate the tip is $3.60 + $1.80 = $5.40.