Can you help Me? I think i got the answer but im not sure can you help me?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Which of the following circles have their centers in the third quadrant?

He letter p on the number line below represents the number . (use the hyphen for negative numbers and write answer as a decimal, such as –7.2) number line from negative 7 to positive 7 in increments of 0.5 is shown. only the whole numbers are labeled. a point labeled p is placed at the eleventh tick mark to the left of 0.