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Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)