In an algebraic pyramid, you find the expression in each block by adding the expressions in the two blocks below it. Copy and complete these pyramids.
Simplify these expressions by collecting like terms.
a 2a + 3a + 5b
b 3c + 5c + 2d + d
c 4x + 5y + 3x + 2y
d 7h + 8g + 2h + g
e 4t + 1 + 3t + 9
f 6m - 2m + 7n - 3n
g 10q - 5q + 17 - 9
h 6t + 3v - 4t + v
i 9k + 5f - 3k - 2f
j 7r + 2s + 3t - 2r + s + 2t
k 11q + 6y + 9 - 3y - 7
l 12 + 6h + 8k - 6 - 3h + 3k