Estimate an 18% tip for a $63.30 meal

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?