Answer: 3t^2-9t+2
Step-by-step explanation: im assuming you meant +2. First you need to distribute 3t^2-15t+6t+2 and then you need to combine like terms.
B. a rectangle with a length of 11 units and a width of 9 units
C. a square with side lengths of 20 units
D. a rectangle with a length of 20 units and a width of 11 units