Steps for solving 4x - 12 = 20 are shown. Explain how Step 3 helps solve the equation. 4x-12-20 Original equation 4x- 12+12-20 +12 Step 1 4x - 32 Step 2 4x 32 Step 3 4 4 X-8 Step 4 A. Dividing both sides by 4 eliminates the variable. B. Multiplying both sides by 4 isolates the variable. C. Dividing both sides by 4 isolates the variable. O D. Multiplying both sides by 4 undoes the division.

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !

shorter then the tree