The area of a trapezoid varies jointly with the height of the trapezoid and the sum of its two bases. the area of one trapezoid is 150 square centimeters when its height is 12 centimeters and its base sum is 25 centimeters. what is the area of a trapezoid having a height of 20 centimeters and a base sum of 35 centimeters?

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

hint: which coefficient is a multiple of 360°?

step-by-step explanation: