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what is the s. a.?

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Write 17/20 as a decimal and as a percent.

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.