Answer:

Step-by-step explanation:

Simplified becomes;

Simplifying further gives; 
Answer:
try D it seems right to me
Pretty simple, really - all you have to do us divide 509 by 14 before you're left with an answer of <span>36.35. Now, the number '36' is closer to 0 than 100, so we'll round down instead of up, therefore the number of floors to the building is 36! </span>
Well, not specific. But after 7 hour the bus will be 210mi away
Hope i help <span>42/2= 21
21 / 3 = 7
Answer=2 x 3 x 7</span>