Higher order thinking see guys work . is his answer correct ? what mistake did he make?
(mental math)

guys work

8,265-7,145
= (8,265-55) (7,145+55)
=8,210-7,200
=1,010​

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

b

step-by-step explanation:

h * s * a

h = history teacher

s = science teacher

a =   art teacher.

i see no data table, but just multiply the number of history teachers, science teachers, and art teachers.