Finding the rate of a tax or commission The sales tax for an item was $11.70 and it cost $390 before tax.
Find the sales tax rate. Write your answer as a percentage.
1%
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Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

This is about circle theorems. someone asap : (

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.