What is the shape of the cross section of the figure that is perpendicular to the rectangular base but does not pass through the top vertex?

A rectangular pyramid.
a parallelogram that is not a rectangle
a rectangle
a triangle
a trapezoid

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Set up and solve a proportion for the following application problem. if 55 pounds of grass seed cover 404 square feet, how many pounds are needed for 7272 square feet?

Parabolas y=−2x^2 and y=2x^2+k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.