Mp identify repeated reasoning the science department buys
the equipment shown in the table. they boi ght all three items this
year. in how many years will they have to buy all three items again?

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -