Add: 5(0.5k−1)+2(0.4−k) . Answer should be in decimal form

Answer 1

5(0.5k - 1) + 2(0.4 - k)

= 2.5k - 5 + 0.8 - 2k

= (2.5k - 2k) + (0.8 - 5)

= 0.5k - 4.2