7 and 19 are both prime numbers.
Factors of 7
1 * 7 = 7
7 * 1 = 7
factors are 1 and 7
Factors of 19
1 * 19 = 19
19 * 1 = 19
factors are 1 and 19
GCF = greater common factor
So GCF is 1 because there is no greater common number in the 7 and 19
Answer:
The answer is the fourth option, 5.
Best choice for variables.....I would let students be " s " and parents be " p "
Answer:
set mary is x years old, and helen is y years old.
first sentence:x=2y
second one:4(y-8)=x+4
bring x=2y in 4(y-8)=x+4
=>4y-32=2y+4
=>2y=36
=>y=18
=>x=36
mary:36
helen:18
