D (3) (-9) = .
H-24 = 4 =

r u trying to look for the values of D and H?

D (3)(-9) = 0

D -27 = 0

D = 27

H - 24 = 4

H = 4 + 24

H = 28

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 -