Given: -7+3x^2-5x 20) write the polynomial in standard form.
a) -7+3x^2-5x b) 3x^2-5x-7. c) -7-5x+3x^2

21) identify the coefficient of the first term when the polynomial is written in standard form.
a)-7. b) -5. c) -3. d) 3

22) identify the constant.
a) -7 b) -5. c) -3. d) 3

23) identify the coefficient of the second term when the polynomial is written standard form.
a) -7. b) -5. c) -3. d) 3

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above