Answer: A
Step-by-step explanation:
Answer:
No
Step-by-step explanation:
1 is a prime number
0 is the only number that is neither prime or composite
Answer:
Step-by-step explanation:
Answer:
20) yes
21) -1
22) 1
23) -4
Step-by-step explanation:
Group 'em together
a
b
−
a
+
1
−
b
a
b
−
a
=
a
(
b
−
1
)
Notice that there will be a 1 as without it it'll simply be ab
1
−
b
=
1
(
1
−
b
)
Notice that it doesn't match with the upper one... so we'll change the signs
1
(
1
−
b
)
=
−
1
(
b−
1
)
(try to multiply them now!!
Jot them down in one expression
a
(
b
−
1
)
−
1
(
b
−
1
)
You get!!!!!!
(
a
−
1
)
(
b
−
1
)
