tiffanyliu1 tiffanyliu1

23-02-2019
Mathematics

contestada

A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels.

Respuesta :

taylorm2088 taylorm2088

23-02-2019

4 nickles
Explanation:
80=N+D
7.80=0.05N + 0.1D

D=80-N

7.80=0.05N + 0.1(80-N)
7.80=0.05N + 8 - 0.1N
0.1N + 7.80 = 8 + 0.05N
0.05N = 8-7.80
0.05N = 0.2
N= 4

Answer Link

Otras preguntas

what is 1/2 divided by 74

What rotation was applied to triangle DEF to create D’E’F’?

Which of the following indicates that people are avoiding your civic responsibilities?

Can someone Help me please

5. (04.07)Which of the following exponential functions goes through the points (1, 12) and (2, 36)? (2 points)f(x) = 3(4)^xf(x) = 4(3)^-xf(x) = 3(4)^-xf(x) = 4(

Which equation can be used to solve for the unknown number? Seven less than a number is thirteen. n-7=13 7-n=13 n+7=13 n+13=7

what is the targeted temp during acls

The Magna Carta was important in English history because it: centralized power. affirmed the divine right of monarchs. granted the nobles the right to app

When determining the shape of a molecule, it is important to draw a Lewis Dot structure first in order to see the total number of...?A. electrons within the mol

Do you think that using robots at home would be good and helpful?