A rectangle has a length of (x+6) units and a width of (x - 5) units. What is the area of the rectangle in terms of x?
A (x^2 – 30) square units
B (x^2 +30) square units
C (x^2– x+30) square units
D (x^2+– 30) square units

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?