3.4-2.8d+2.8d-1.33.4-2.8d+2.8d-1.3

Combine like terms to create an equivalent expression.

Answer: 4.2

Step-by-step explanation:

These two expressions are best combined using the positive and negative signs

3.4-2.8d+2.8d-1.3

3.4-2.8d+2.8d-1.3

3.4 + 3.4 + (-2.8d - 2.8 d) + (2.8d + 2.8d) + (-1.3 - 1.3)

= 6.8 + ( - 5.6d) + (5.6d) + (-1.3-1.3)

= 6.8-5.6d+5.6d-2.6

= 6.8 - 2.6

= 4.2

First you combine like terms with their sign so it would be - 2.7d + 2.8d =.1d - 2.8d = - 1.8 + 2.8 = 1d

1d = d

so then combine the other like terms: 3.4-1.33 = 2.07 - 1.3 =.77

therefore the answer is d+0.77

(i think but i just did this mentally.)