1.a Write three equivalent expressions to find the final price of an item costing g dollars that is on sale for 15% off and 7% sales tax. 1.b Using all of the expressions, determine the final price for an item that costs $75. If necessary, round to the nearest penny.

1.c If each expression yields the same final sale price, is there anything to be gained by using one over another?

1.d Describe the benefits, special characteristics, and properties of each expression.

Please help!
This is the EngageNY Accelerated Math 7/8 curriculum Module 2 Topic C Lesson 19 exit ticket!

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