Collect like terms.

Question

A).  -4d - 6a + 3a - 5d + 1                                           B).  3.2x + 2.9y - 5.8x - 8.1

Answer 1

A).  -4d - 6a + 3a - 5d + 1  

Collect like terms using associative property of addition: ab + ac = a(b+c)

-4d + a(-6 + 3) - 5d + 1

-4d -3a -5d + 1

Commutative property of addition: a + b = b + a

-3a - 4d -5d + 1

-3a + d (-4 -5) + 1

-3a -9d + 1

Answer 2

B).  3.2x + 2.9y - 5.8x - 8.1

Commutative property of addition: a + b = b + a

3.2x - 5.8x + 2.9y - 8.1

Associative property of addition: ab + ac = a(b+c)

x(3.2-5.8) + 2.9y - 8.1

-2.6x + 2.9y - 8.1