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
Answer:
About 3.6 times greater.
Step-by-step explanation:
That is 1.793 * 10^8 / 5.01 * 10^7
= 1.793 / 5.01 * 10^(8-7)
= 0.36 * 10
= 3.6
That would be called the quotient.
The mean would be 7 I think I am not sure
Answer: i believe bill saved $21.44
Step-by-step explanation: 68.99-57=11.99
37.80-25%=28.35
37.80-28.35=9.45
9.45+11.99=21.44
