Question

combine any like terms in the expression. if there are no like terms, rewrite the expression.
$42rt^{3} + 33r^{3}st + 12r^{3}st - 5r^{3}st - 40r^{3}st$

Explanation:

Step1: Identify like terms

Like terms: $33r^3st$, $12r^3st$, $-5r^3st$, $-40r^3st$; $42rt^3$ has no like terms.

Step2: Combine like terms for $r^3st$

$$33r^3st + 12r^3st - 5r^3st - 40r^3st = (33+12-5-40)r^3st$$

Step3: Calculate the coefficient

$$(33+12-5-40)r^3st = 0r^3st = 0$$

Step4: Simplify the full expression

$$42rt^3 + 0 = 42rt^3$$

Answer:

$42rt^3$