Question

Your friend evaluates (10 – k) = 5 for k= 5, and gets 9 for an answer. Explain your friend's error.

A)My friend subtracted by 5 and subtract again by 5.
B)My friend added by 5 and then divided by 5.
C)My friend divided by 5 and subtracted 1 from 10.
D)My friend subtract first and then divided by 5.

Answer 1

Your friend's error is that they subtracted 5 from 10 and then subtracted k (which is 5) from the result. The correct way to evaluate (10 – k) = 5 for k = 5 is to substitute the value of k into the equation and then simplify.

Step-by-step explanation:

Your friend's error is that they subtracted 5 from 10 and then subtracted k (which is 5) from the result. The correct way to evaluate (10 – k) = 5 for k = 5 is to substitute the value of k into the equation and then simplify: (10 - 5) = 5 5 = 5

So the answer is true, and your friend made an error by performing unnecessary extra subtraction. The correct answer is option A) My friend subtracted by 5 and subtracted again by 5.