The formula for finding the perimeter of a rectangle is P = 2 × l + 2 × w. For which of the following quadrilaterals could you NOT use this formula to find its perimeter?
A.

Parallelogram
B.

Rhombus
C.

Square
D.

Trapezoid

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.