Steps for solving 4x - 12 = 20 are shown. Explain how Step 3 helps solve the equation.
4x - 12 - 20
4x-12 +12 - 20 +12
4x = 32
4x32
4
X=8
Original equation
Step 1
Step 2
Step 3
Step 4
A. Multiplying both sides by 4 undoes the division.
O B. Dividing both sides by 4 isolates the variable.
O C. Multiplying both sides by 4 isolates the variable.
O D. Dividing both sides by 4 eliminates the variable.

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step-by-step explanation:

just for that im not answering

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m