Answer:
The easiest way I can think of to show someone who is not very mathematically inclined that the calculation is wrong (other than using a scientific calculator) is this:
Explain that one half contains four eighths - you can visualize this very simply with a pie chart.
Then tell Anna that mathematically speaking this translates to the equation:
1/2 = 4 * 1/8
Now, if ONE half is equal to four times ONE eighths, then SEVEN halves is equal to four times SEVEN eighths - basically, you just multiply both sides by 7:
7/2 = 4 * 7/8
Now, compare this to the equation proposed by Anna:
7/2 = 1½ * 7/8
I guess, at this point it will be easy to convince Anna that 1½ is not 4, and therefore her equation is faulty.
-----
Alternatively, if she's sound with fractions you could also tell her that to get from 7/8 to 7/2 you will need a factor which only affects the denominator as the numerator stay the same. The factor that turns 8 into 2 is 1/4 but since this takes place in the denominator we need the reciprocal to turn 1/8 into 1/2 - and the reciprocal of 1/4 is of course 4. At which point we've arrived at the same place of argumentation as before (which is that 4 ≠ 1½).
Step-by-step explanation:
hope this helps :)
Answer:
Step-by-step explanation:
The graph crosses the y-axis at (0,-2).
The slope of the graph is 3.
y = 3x - 2
Answer:9
Step-by-step explanation:
First you divide 2 on both sides. You should get x-3=6.
Then, you add 3 to both sides and you get x=9.
Two positive numbers have a difference of 5. The larger number is two more than twice the smaller. Find the two numbers.? Follow . 6 answers 6. Report Abuse ... The larger number is 5 more than twice the smaller. Find the two? The difference of two positive numbers is 9. The larger is twice the smaller decreased by 5.
64
-------------------------------