N the United States, the average public school teacher currently earns an annual salary near $55,202. Reported national average salaries for the last six decades are listed below. Year National Average Teachers' Salary 1960 $4,995 1970 $8,626 1980 $15,970 1990 $31,367 2000 $41,807 2010 $55,202 Determine the average salary increase per year between the years 1980 and 1990. $1,539.70 $8,367.80 $2,566.20 $1,004.10

$1,539.70

Step-by-step explanation:

Given the data :

National average Teachers' salary (NATS)

YEAR:_1960 _ 1970 _ 1980 _ 1990 _ 2000 2010

NATS:4995_8626_15970_31367_41807_55202

AVEAGE SALARY INCREASE PER YEAR BETWEEN 1980 and 1990

Salary in 1980 = $15970

Salary in 1990 = $31367

Average salary increase per year:

Difference in salary / difference in years

$(31367 - 15970) / (1990 - 1980)

= $15397 / 10

= $1539.7

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

step-by-step explanation: