The cost c (in dollars) of building a house is related to the number k of carpenters used and the number e of electricians used by the formula† c = 15,000 + 50k2 + 60e2. if the cost of the house is fixed at $100,000, find dk/de e = 15

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?