An engineer is planning a new water pipe installation. the circular pipe has a diameter of d=20cm. what is the area a of the circular cross section of this pipe? give your answer in terms of pi.

The figure above shows the lengths of thesides of a rectangle in cm. find the valuesof x and y and then the area of the rectangle.sides: top= 3x - yleft= 3y + 4bottom= 2x + yright= 2x - 3 use both methods, elimination and substitution, if possible.

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?