Find the exact length of the third side.
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∠1 and ∠2 are vertical angles. ∠2 has a measure of 63°. what is the measure of ∠1 ? enter your answer in the box.

Charlene's parents deposit $500 in an account on the day she is born. the account earns a high interest rate of 9.2% compounded quarterly because charlene is not allowed to access the money until her 22nd birthday. how much money will charlene have on her 22nd birthday? a: $3,698.50 b: $5,921.31 c: $101,200 d: $ 824.58

The sales tax for an item was $8.40 and it cost $420 before tax. find the sales tax rate. write your answer as a percentage.