10.what are the rule for finding the nth term? [6,12,18,24,30,36,42]
a. 2n+1
b. -2n
c. 6n
d. 3n-1
11. Which of these shows a mathematical expression?
a. 11a = 121
b. 32+(3 X 9) =59
c. 3k+ 7 = 34
d. (9 X 2) - 25
12. Which of these shows a mathematical equation?
a. 5 X (10 + 7)
b. 2 X + 9
c. 9a + 7
d. 5y — 9 = 13
13. Which of these shows a mathematical equation?
a. I5(6 - 2) = 60
b. (3 X 2) + b
c. (8 + 3( - 5
d.9

[ A pile of has 40 blocks in the bottom row, 36 blocks in the second row, 32 blocks on the third row and so on until there are only 4 blocks on the top row.]

14. How many blocks are there in the 7ᵗʰ row?
a. 12 blocks
b. 14 blocks
c. 16 blocks
d. 18 blocks
15. How many blocks are therein all?
a. 210blocks
b. 220 blocks
c. 240 blocks
d. 260 blocks​