A city has 4 new houses for every 9 old houses. If there are 28 new houses in the city, how many old houses are there? A. 61
B. 63
C. 67
D. 65

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500