Which advancement in mathematics contributed to improvements in algebra? the use of formulas to show data
the use of vertical and horizontal axes
the development of multiplication
the substitution of letters for unknown numbers

Which of the following are characteristics of soft money? i. donations from individuals and interest group pacs ii. unregulated by the federal election commission iii. goes directly to a political candidate iv. can be used for advertising or other campaign expenses a. i, ii, iii, and iv b. i and ii only c. i, iii, and iv only d. ii, iii, and iv only\