write into an expresion

Question

two times the quantity of the difference of a number and eight plus four times the same number subtracted from ten

Answer 1

"The quantity" usually means use parentheses. "Difference" means subtract. "A number" means a number we don't know, i.e. a variable (we'll use x). Subtracted FROM 10 means you have to write the 10 first then subtract the other thing (4 times "a number"). Thus...

2(x - 8) + 10 - 4x