The mean score on a physics test was 75 points. Amy’s score was 67 points, which was 2 standard deviations below the mean. What is the variance of the data set? 2 4 8 16 ANSWER ON EDGE IS D, LAST ONE just took the test

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x