Find f(-6) when f(x)=4x+1

Ihave this math question 2/3 ÷2 1/10=

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?