Carol, marcy and diana together have $847.40. marcy has 4
times as much money as carol, and diana has $31.81 less than
marcy. how much money do carol and marcy have altogether?

The  amount of money Carol and Marcy have altogether is  

Step-by-step explanation:

Let

x ----> the amount of money Carol has

y ----> the amount of money Marcy has

z ----> the amount of money Diana has

we know that

----> equation A

----> ----> equation B

----> equation C

substitute equation B and equation C in equation A

Solve for y

Find the value of x

--->

so

The amount of money Carol has is $97.69

The amount of money Marcy has is $390.76

therefore

The  amount of money Carol and Marcy have altogether is equal to

in 2010, the population of the state of california is 37.29 × 10⁶

step-by-step explanation:

population of los angeles = 3.79 × 10⁶

population of california = 9.84 × population of los angeles

                                        = 9.84 × 3.79 × 10⁶

                                        = 37.2936 × 10⁶

                                        = 37.29 × 10⁶

∴ in 2010, the population of the state of california is 37.29 × 10⁶