Problem #1
16
41
?

1-15. a: b: 42 tiles. Add 4 tiles to get the next figure. 1-16. a: x = 0 b: all real ... 3-78 does, possible response: the b in its equation is 3 versus 1 in problem 3-79. ... If x is the age of the van, then x + (x + 17) = 41 or if x is the age of the truck, then.

Step-by-step explanation:

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 -