**Step-by-step explanation:**

8.9x-5 and -6.8x+8

8.9-6.8 + -5+8

2.1x+3

3(30+2). first you would do 3x30. 3x30=90. then you would do 3x2. 3x2=6. then you would add. 90+6=96. hope this helped

**Answer:**

**Step-by-step explanation:**

Exterior equals the sum of opposite interior angles

x = 49 + 90

**x = 139°**

**Given:**

Total amount of new laptop = $335

Down payment = $50

Number of equal monthly payments = 6

Amount of monthly payments =

**To find:**

The equation that represents the given situation.

**Solution:**

We have,

Amount of monthly payments =

Total amount for 6 equal monthly payments =

We know that,

Total amount = Down payment + Total amount of all monthly payments

**Therefore, the required equation for the given situation is .**

**Answer:**

2x + 7y and 7g + 3h

**Step-by-step explanation:**

(a)

3x + 5y - x + 2y ← collect like terms

= (3x - x) + (5y + 2y)

= 2x + 7y

(b)

3g + 5h + 4g - 2h ← collect like terms

= (3g + 4g) + (5h - 2h)

= 7g + 3h