If we let p and t be the masses of the paper and textbook, respectively, the equations that would best represent the given in this item are:

(1) 20p + 9t = 44.4

(2) (20 + 5)p + (9 + 1)t = 51

The values of p and t from the equation are 0.6 and 3.6, respectively. Thus, each paperback weighs 0.6 pounds and each textbook weighs 3.6 pounds.

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**Answer:**

x=4

**Step-by-step explanation:**

2x-3=9-x

1. add 3 to -3 and 9, which will cancel out -3 and leave you with 2x=12-x

2. add x to 2x and -x which will cancel out -x and leave you with 3x (there will always be a 1 in front of x if it has no variable in front of it x=1) which will leave you with 3x=12

3. divide 12 by 3 and you get 4..so x=4

**Answer:**

Simplify the expression.

Exact Form:

1/6561

Decimal Form:

0.00015241

…

**Step-by-step explanation:**

1/6561

**Answer:**

10 hours

**Step-by-step explanation:**

speed = distance/time

s = d/t

d = st

d = 75 km/h * 8 h = 600 km

t = d/s

t = 600 km/(60 km/h) = 10 h

Answer: 10 hours