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How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.