[factoring][section 40]
(1.) 18 here is the problem
18
/\
2 9
/ \
3 3
make a factor tree
result: 18 = 2*32
(2.) 36 here is the problem
36
/ \
9 4
/ \ / \
3
3 2 2
make a factor tree
result: 36 = 22 * 32
(3.) 21 here is the problem
21
/\
3 7
make a factor tree
result: 21 = 3*7
(4.) 15 here is the problem
15
/ \
3 5
make a factor tree
result: 15 = 3*5
(5.) 42 here is the problem
42
/ \
6 7
/ \
2
3 make a factor tree
result: 42 = 2*3*7
(6.) 45 here is the problem
45
/ \
9 5
/ \
3
3 make a factor tree
result: 45 = 32 * 5
(7.) 49 here is the problem
49
/\
7 7
make a factor tree
result: 49 = 72
(8.) 25 here is the problem
25
/ \
5 5
make a factor tree
result: 25 = 52
(9.) 28 here is the problem
28
/ \
4 7
/ \
2 2
make a factor tree
result: 28 = 22 * 7
(10.) 33 here is the problem
33
/ \
3 11
make a factor tree
result: 33 = 3*11