Can someone tell me how to add and subtract fractions with unlike denominators, i've been having trouble for 2 years, and still do not understand.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3

Question 9 of 10 2 points suppose your sat score is 1770. you look up the average sat scores for students admitted to your preferred colleges and find the list of scores below. based on your sat score of 1770, which average score below represents the college that would be your best option? o a. 1790 o b. 2130 o c. 2210 od. 1350