The first step for solving this problem is to simplify the radical
7

x 2√6
Calculate the product
14

Subtract the numbers
14

Simplify the radical
14 x 2

Multiply the numbers
14 x 2√78
Finally,, calculate the product for your final answer
28√78
Let me know if you have any further questions
:)
During the birthday 4/7 of the cake was eaten so it remained 1-4/7=3/7
the next day 1/2 of 3/7 was eaten what remained is 3/7 divide by 1/2
to divide we invert the second fraction (1/2) and multiply 3/7
3/7 x 2/1=6/7
I believe the answer is 157