If the sales tax for the city of San Diego is 9%, how much tax would you pay for an item that costs $200.00? (With work)

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What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling