The mass of an electron is approximately 9 × 10-28 grams, while the mass of a neutron is approximately 2 × 10-24 grams. Which of the following is true?
A.
The mass of a neutron is approximately 2,000 times the mass of an electron.

B.
The mass of a neutron is approximately 20,000 times the mass of an electron.

C.
The mass of a neutron is approximately 10,000 times the mass of an electron.

D.
The mass of a neutron is approximately 1,000 times the mass of an electron.

A.  Approximately 2000 times the mass of an electron.

Step-by-step explanation:

Lets do the division:

Mass of neutron / mass of electron

2 × 10^-24  / 9 x 10^-28

= 0.222 x (10^(-24 - (-28))

= 0.2222...  x 10^4

= 2222.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540