Need help asap please

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

Write the rational number in lowest terms 99/-15

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?