Seudónimo Seudónimo 01-12-2020 Mathematics contestada What is the sum of (-2.1x + 3.7) and (5 + 4.9x)? A. -7.0x + 8.7 B. -2.8x + 8.7 C. 2.8x + 8.7 D. 7.0x + 8.7