Pls last diagnostic need real help

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Evaluate the expression for the given value of the variable 7a - 4a for a =8

What is the average diastolic blood pressure for adults

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°