Question

1. (3r + 6t) + (2r + 7t) + 4t + (-3r)

Explanation:

Step1: Remove parentheses

$3r + 6t + 2r + 7t + 4t - 3r$

Step2: Group like terms (r terms)

$(3r + 2r - 3r) + (6t + 7t + 4t)$

Step3: Combine like terms (r terms)

$2r + (6t + 7t + 4t)$

Step4: Combine like terms (t terms)

$2r + 17t$

Answer:

$2r + 17t$