We have been given the steps to solve the equation as
Step 1: 2x = 18
Step 2: x = 18 − 2
Step 3: x = 16
There is an error in step 2.
x is in multiplication with 2. So in order to get rid of 2 from the left hand side, we perform opposite operation of multiplication i.e. division.
So we must divide both sides by 2.
Therefore, A is the correct option.
A) She did not divide 18 by 2.
65 i think
The given table is
From the given table it is clear that the value of y increases by 10 when the value of x increases by 5. It means the rate of change is constant.
So, the given table represents a linear relationship.
If a linear function passes through the two points then the equation of line is
The linear function passes through (5,10) and (10,20), so the equation of line is
It means it passes through the origin, i.e., (0,0).
Ming has described a proportional relationship because the ordered pairs are linear and the line passes through the origin.
Therefore, the correct option is A.
We have been given that it takes 3.5 hours to complete 500-mile Nascar race.
We know that
1 hour = 60 minutes
and 1 hour = 3600 seconds.
Therefore, when we calculate the time taken in minutes we need to multiply 3.5 to 60 and to find the time to complete the race in seconds we need to multiply 3.5 by 3600.
Thus, the time taken to complete the race
Hence, it takes 210 minutes to complete the race.
Now, let us find the time in seconds. The number of seconds to complete the race is
Therefore, the order of magnitude of the number of seconds is 4.