2. There are 15 animals in the barn. Some are cows and some are roosters. There are 48 legs in
all. Write a system of equations that can be used to determine how many cows and how many
roosters are in the barn.

(9, 6)

Step-by-step explanation:

With 15 animals in total, the equation for the number of animals is

x + y = 15    with x for cows and y for roosters.

With 48 legs in total, the equation for the number of legs is

4x + 2y = 48    with x for cows and y for roosters.  The numbers in front of each variable represent the number of legs each animal has.

Set the first equation equal to y.

y = 15 - x

Substitute this equation into the second equation and solve.

4x + 2y = 48

4x + 2(15 - x) = 48

4x + 30 - 2x = 48

2x + 30 = 48

2x = 18

x = 9

Substitute this value into the first equation and solve.

x + y = 15

9 + y = 15

y = 6

The solution is (9, 6).

step-by-step explanation:

i found the life tables for the year 2012. 

life table of males at age 30. probability of dying between ages x and x+1

total population:  

29–30 . . . . . . . . . . . . 0.001030

30–31 . . . . . . . . . . . . 0.001061

males:  

29–30 . . . . . . . . . . . . 0.001420

30–31 . . . . . . . . . . . . 0.001448

white population

29–30 . . . . . . . . . . . . 0.001005

30–31 . . . . . . . . . . . . 0.001037

white males

29–30 . . . . . . . . . . . . 0.001372

30–31 . . . . . . . . . . . . 0.001399

non hispanic white population

29–30 . . . . . . . . . . . . 0.001083

30–31 . . . . . . . . . . . . 0.001116

non hispanic white males

29–30 . . . . . . . . . . . . 0.001477

30–31 . . . . . . . . . . . . 0.001503

jacob, non hispanic white male. 30 years old.

probability that jacob lives to be 30 years old. 

since the given probabilities are probabilities of dying, i think we simply subtract it from 1 to get the probability of living. we will use the probability of non hispanic white male.

                                          probability of living to be 30 y.o.

29 - 30 : 1 - 0.001477 = 0.998523

30 - 31 : 1 - 0.001503 = 0.998497

beluga wheeeaaalle matt

step-by-step explanation: