Question

Please help and show work! Simplify each expression!

Answer 1

Answer:

see below

Step-by-step explanation:

⇒  -7y - (-12y) = -7y + 12y =  5y

⇒  15xy - (-6xy) = 15xy + 6xy = 21xy

⇒  -53va - 32va =    - 85av

⇒  64 / 0.8 -5.6 / 7

   = 448 - 7.48

          5*6

    = 79.2

⇒    -(x -3) + 6

   = -x + 3 + 6

   = -x + 9

⇒  6 + 3 (9)

   = 6 + 27

   = 33

Evaluate the expressions if x = 10, y = 5, and z = 1.

⇒  x/y = 10 / 5 = 2

⇒  xy + z = 10*5 + 1 = 51

⇒  5 (z - x) = 5(1 - 10) = 5 - 50 = 45

Answer 2

Answer:

See below

Step-by-step explanation:

• -7y - (-12y) =  -7y + 12y = (-7+12)y = 5y

•  15xy- (-6xy) =  15xy + 6xy = (15+6)xy = 21xy

• -53va - 32va  = (-53 -32)va = - 85va

• 64 / 0.8 - 5.6 / 7 = 640/8 - 56/7×1/10 = 80 - 8/10 = 80 - 0.8 = 79.2

• -(x -3) + 6 = -x + 3 + 6 = -x + 9

• 6 + 3 (9) = 6 + 27 = 33

Evaluate the expressions if x = 10, y = 5, and z = 1.

• x/y =  10/5 = 2

• xy + z  = 10×5 + 1 = 50 + 1 = 51

• 5 (z - x) = 5×(1 - 10) = 5×(-9) = -45