Which of these are unit rates
a square yard for every 100 grass seeds
4 acres for 800 plants
2 plants in a square foot
6 plants in 1 square yard
8 seeds per square foot
25 trees per 25 square yards

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Anyone know? will mark brainliest if correct!

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.