Dplus2008 Dplus2008
  • 16-02-2017
  • Mathematics
contestada

Shawntee has 21 coins all of them nickel and dimes that are worth $1.70. Write a system of equations and splve

Relax

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 16-02-2017
n+d=21
5n+10d=170

so

multiply first equation by -5 and add to other one

-5n-5d=-105
5n+10d=170 +
0n+5d=65

5d=65
divide both sides by 5
d=13

sub back


n+d=21
n+13=21
minus 13 both sides
n=8




8nickles
13 dimes
Answer Link

Otras preguntas

Determine the equation of g(x) that results from translating the function f(x)=(x+4)^2 to the right 11 units.
(3 x 10^4) + (2 x 10²) + (4 x 10) = simplifies to what?
17. Which philosophy is evident in Monk Sewing attributed to Kao Ninga?   Zen Pure Land Buddhism Shinto Daoism
what is 3/4 of 16/21
which plate is covering most of two continents ? what two continents?
If Sean earns 8.50 per hour and made a total of 80.75 today,how many hours did he work?
The most successful manner in which the Byzantines spread Christianity was through?
What is the lateral area of the rectangular prism? Assume the prism is resting on its base.
Consider the following equation: 4NH₄ + 5O₂ → 4 NO + 6H₂O How many moles of water are produced when 2 moles of NH4 react with excess Oxygen gas?
What were sea grapes adaptations ?