Aplane flew between two cities at 330 mph a car went the same distance at 55 mph and it took 7.5 hours longer how far apart are the two cities

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

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Someone which statements are true? check all that apply.