marting1667 marting1667

23-05-2017
Mathematics

contestada

A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each

Respuesta :

PHDFlopper PHDFlopper

23-05-2017

10x+20y=540
x+y=34
y=34-x

Plug in (34-x) for y:
10x+20(34-x)=540
10x+680-20x=540
-10x=-140
10x=140
x=14

There were 14 ten cent coins and 20 20 cent coins

Answer Link

Otras preguntas

solid gives pressure in downward direction, how

d=(107-115)^2+(-49+-69)^2

Two children push on heavy crate that rests on a basement floor. one pushes horizontally with a force of 150 N and the other pushes in the same direction with a

Which of the following equations has an infinite number ofsolutions? 3(2x+1)=2(1+3x)+13(2x+1)=2(1+3x)-13(2x-1)=2(1+3x)-13(2x+1)=2(3+2x)-3

What is the answer to the photo

where does bacteria gain energy

Name a method that could be used to separate magnesium hydroxide from sea water

Angle a =8x+6 Angle b= 4x+38 Solve for x and find the measure of angle b

Question 2 What is a standing committee?

What is 3NF in database design?