Help please!!.Use estimation to check the answer to this story problem.

Priscilla had some stickers. She gave 21 stickers to her friends. She has 68 stickers left. How many stickers did Priscilla have to begin with?

A.70−20=□

The student's answer was reasonable.

B.60+20=□

The student's answer was not reasonable.

C.70+20=□

The student's answer was not reasonable.

D.70−30=□

The student's answer was not reasonable.

A student answered that Priscilla began with 47 stickers.

Which statement about the best estimation strategy for this problem is correct?

Part a what is the area of triangle i? show your calculation. part b triangles i and ii are congruent (of the same size and shape). what is the total area of triangles i and ii? show your calculation. part c what is the area of rectangle i? show your calculation. part d what is the area of rectangle ii? show your calculation. part e rectangles i and iii have the same size and shape. what is the total area of rectangles i and iii? show your calculation. part f what is the total area of all the rectangles? show your calculation. part g what areas do you need to know to find the surface area of the prism? part h what is the surface area of the prism? show your calculation. part i read this statement: “if you multiply the area of one rectangle in the figure by 3, you’ll get the total area of the rectangles.” is this statement true or false? why? part j read this statement: “if you multiply the area of one triangle in the figure by 2, you’ll get the total area of the triangles.” is this statement true or false? why?

The distributive property allows you to say that 3(x − 1) = 3x −

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.