Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.
The first step to solve this problem is to:

1.   ?    Figure out what the numbers mean and assign variables to them.
2.   ?    Write the equation.
3.   ?    Find the answer.

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.

Which of the following is correct?

1.   ?    ΔD = ?
   ΔT = 30 miles
   S = 2 hours
2.   ?    ΔD = ?
   ΔT = 2 hours
   S = 30 miles
3.   ?    ΔD = 30 miles
   ΔT = 2 hours
   S = ?
4.   ?    ΔD = 30 miles
   ΔT = ?
   S = 2 hours

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2 is?

1.   ?    Solve for speed
2.   ?    Solve for Distance
3.   ?    Write the formula for speed.
4.   ?    Write the formula for distance

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2: Formula

The formula you need is:

1.   ?    a = ΔS/ΔT
2.   ?    S = ΔT/ΔD
3.   ?    S = ΔD/ΔT
4.   ?    S = ΔD(ΔT)

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2: Formula
S = ΔD/ΔT

Step 3 is?

1.   ?    Give the answer
2.   ?    Assign variables
3.   ?    Find the formula
4.   ?    Put in numbers

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2: Formula
S = ΔD/ΔT

Step 3: Put in numbers

Which of the following is correct?

1.   ?    30 mi = ΔD/2 hrs
2.   ?    S = 30 mi/2 hrs
3.   ?    S = (30 mi) X (2 hr)
4.   ?    S = 2 hrs/30 mi

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2: Formula
S = ΔD/ΔT

Step 3: Put in numbers
S = 30 mi/2 hrs

Step 4 is?

1.   ?    Find the right formula
2.   ?    Calculate the answer
3.   ?    Stick in the numbers
4.   ?    Assign variables

Problem: A car drives 30 miles in 2 hours. Calculate the car's speed.

Step 1: assign variables.
ΔD = 30 miles
ΔT = 2 hours
S = ?

Step 2: Formula
S = ΔD/ΔT

Step 3: Put in numbers
S = 30 mi/2 hrs

Step 4: Calculate the answer

The answer is:

1.   ?    S = 15 mph
2.   ?    S = 32 mph
3.   ?    S = 28 mph
4.   ?    S = 60 mph