Answer:
(a) 4
(b) 4 * (7+3)
Step-by-step explanation:
(a) Let's first start by prime factorizing (finding the prime factors) 28 and 12:
12: 2*2*3
28: 2*2*7
We can see here they both share a common factor of 2*2, which is 4, therefore the GCF is 4.
(b) Factor a 4 out from the equation:

This gives us:
4 * (7+3)
Answer:
B, 
Step-by-step explanation:
B 
A
C
D
Answer:
18
Step-by-step explanation:
6x5=30
2x8=16
8x1/2=4
30-16=14
14+4=18
Answer:
16.6%
Step-by-step explanation:
(75/89.95)*100=83.37....
100-83.37...=16.62...
=16.6%