(x-1)(x+3)-x^2 kai x=5

How many grams must be adde to 970g to make 1 and a half kg

What is the area of the trapezoid shown ?

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?