First you have all ten books, but then every time after, you loose one because you can't put the same book in the group twice.
10 * 9 * 8 * 7 = 5040 groups
Answer:
-10a + 2b - 3c
Step-by-step explanation:
hope this helps :)
The distance will be given by the equation;
D=

D=

D=

D=

D=13 units
Answer:
yesyesyesyes
Step-by-step explanation:
yesyesyesyesyes
Answer:
c. 24
Step-by-step explanation:
15+9=24