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The population of Spain is 47,042,000. The population of Romania is 21,400,000. Round each number to the nearest ten million. What is the combined population of the two countries? A. 60,000,000 B. 68,000,000 C. 68,300,000 D. 70,000,000

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Figure ABCD is transformed to figure A′B′C′D′: A coordinate grid is labeled from negative 5 to 0 to 5 on both x and y axes at increments of 1. Figure ABCD has A at ordered pair 1, 1, B at 3, 3, C at 4, 2, D at 4, 1. Figure A prime B prime C prime D prime has A prime at ordered pair 1, negative 3, B prime at 3, negative 1, C prime at 4, negative 2, D at 4, negative 3. Which angle in Figure A′B′C′D′ is equal to Angle CDA.? Angle D prime A prime B prime. Angle A prime B prime C prime. Angle B prime C prime D prime. Angle C prime D prime A prime.

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The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17]. Find C^-1 and use it to decode the matrix.

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