Respuesta :

mhanifa

Answer:

  • See below

Step-by-step explanation:

#7

  • a) 2x + 4 = 11 ⇒ 2x = 11 - 4 ⇒ 2x = 7 ⇒ x = 7/2 ⇒ x = 3.5
  • b) 30 - 2x = 16 ⇒ 2x = 30 - 16 ⇒ 2x = 14 ⇒ x = 14/2 ⇒ x = 7
  • c) 28 + 9x = 55 ⇒ 9x = 55 - 28 ⇒ 9x = 27 ⇒ x = 27/9 ⇒ x = 3

#8

100 cookies in 2 hours.

The unit rate is:

  • 100 / 2 = 50 cookies per hour

Find the number of cookies decorated in 5 hours:

  • 50*5 = 250 cookies

Correct choice is D