If c is a 5 x 1 matrix and dis a 3 x 5 matrix, what are the dimensions of dc

Two line segments are shown in the figure below. suppose that the length of the line along the x-axis is 6, and the length of the hypotenuse of the triangle is 10. what is the equation of the hypotenuse line (shown in red, below)?

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Arectangular yard has area 96 square feet. if the width of the yard is 4 feet less than the length