All the members of a construction crew work at the same pace. four of them working together are able to pour concrete foundations in 32 hours. how many hours would this job take if the number of workers decreased 2 times increased 2 times increased 4 times plz plz will give all points

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Acaterer knows he will need 60, 50, 80, 40 and 50 dinner napkins on five successive evenings. he can purchase new napkins initially at 25 cents each, after which he can have dirty napkins laundered by a fast one-day laundry service (i.e., dirty napkins given at the end of the day will be ready for use the following day) at 15 cents each, or by a slow two-day service at 8 cents each or both. the caterer wants to know how many napkins he should purchase initially and how many dirty napkins should be laundered by fast and slow service on each of the days in order to minimize his total costs. formulate the caterer’s problem as a linear program as follows (you must state any assumptions you make): a. define all variables clearly. how many are there? b. write out the constraints that must be satisfied, briefly explaining each. (do not simplify.) write out the objective function to be minimized. (do not simplify.)

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?