Age of a is twice of b if sum of both ages is 18 what is the age of b

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay