Which expressions represent a difference in squares? select each correct a. k^2+81 b. t^2-4 c. 9x^2-100 d. 8x^2-20 e. 4a^2-36

2x+3y=12 x-y=6 solve the following system equations

Find the perimeter of the figure shown above. a. 50 cm c. 30 cm b. 64 cm d. 60 cm select the best answer from the choices provided a b c d

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.