Four more than two times a number is equal to twenty. What is the number?
2006-10-17 14:37:22 · 8 answers · asked by Anonymous in Education & Reference ➔ Homework Help
It's a good idea to not just know the answer, but know how to solve this on a quiz or test. Here's how you do it:
First step is to turn the words into mathematical notation...
(4 more than 2 times a number ) equals 20
replace "2 times a number" with "2x"
and "more than" with "plus"
(4+2x)=20
From there you subtract 4 from both sides
2x=16
and divide both sides by 2
x=8
I hope this helps and I hope you can follow the logic enough to do well when tested in class.
2006-10-17 14:46:37 · answer #1 · answered by LadyPom 2 · 0⤊ 0⤋
8
2006-10-17 21:45:00 · answer #2 · answered by billy-bob Joe-bob 1 · 0⤊ 0⤋
8
2006-10-17 21:41:12 · answer #3 · answered by LaCosaMasBella 3 · 0⤊ 0⤋
start guessing numbers. first, let's try 5. 5*2=10+4=14
Ok that won't work. how about 7? 7*2=14+4=18
close but not yet. let's try 8. 8*2=16+4=20
Yes! that number works. so the number is eight.
use this formula if you don't know how to apply algebra.
2006-10-17 21:43:01 · answer #4 · answered by ~Amber~ 4 · 0⤊ 0⤋
2x+4=20. 2x+4-4=20-4 2x=16 x=8
2006-10-17 21:42:13 · answer #5 · answered by debralizjr 4 · 0⤊ 0⤋
n= a number
2n+4=20
2n=16
n=8
2006-10-17 21:44:43 · answer #6 · answered by harelinefracture 3 · 0⤊ 0⤋
20=4+2x
16=2x
8=x
2006-10-17 21:39:25 · answer #7 · answered by Tori 2 · 2⤊ 0⤋
umm, i think 8
2006-10-17 21:41:12 · answer #8 · answered by Ashley 2 · 1⤊ 0⤋