On your first 3 mathmatics exams you received scores of 79,85, and 74. what do you need to get on the next exam in order to have an 80 average

my method of doing these:

avg = 80

80 80 80

-1   +5   -6 = -2

which means you have to cancel the - 2 out and +2 instead

80+2 = 82

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

1.true 2.false? ? i think. .

step-by-step explanation: