apurister2fly2 apurister2fly2

23-12-2016
Mathematics

contestada

Diane has $1.20 in dimes and nickels. she has a total of 13 coins. how many of each kind does she have?

Respuesta :

apologiabiology apologiabiology

23-12-2016

yeah

120cents

10d+5n=120
divide both sides by 5
2d+n=24

13 coins
n+d=13

we have

2d+n=24 and
d+n=13
muliptly 2nd equation by -1 and add to first

2d+n=24
-d-n=-13 +
d+0n=11

d=11
d+n=13
11+n=13
n=2

11 dimes
2 nickles

Answer Link

Otras preguntas

if the car continues at the same accerleration meaning the slope of the line does not change how fast would it be going in 15 seconds

A 282-inch pipe cut into two pieces. One piece is five times the length of the other. Find the lengths of the two pieces.

Please help me answer with explanations ASAP

An isolated agricultural country has two distinct regions: a lowland plain and an upland of rugged hills. On one unit of land on the PLAIN, a farmer can raise 1

In "The Wish", why did the little boy pick off his scab? a. it was itching fiercely b. He enjoyed the feeling of pulling off scabs, even if they weren't ready.

How does molly characterize Dina in orphan train

Which does Kepler’s second law state about planetary motion? A.The square of the orbital period is directly proportional to the cube of the semi-major axis. B.A

The polynomial function, P(x), has the following zeros: -6, 2, 3, 4i, -4i (each with multiplicity of 1) Crosses the x-axis five times Crosses the x-axis twice C

Imagine Joanne has an employee, Cynthia, whose only job is to restock shelves in the kitchen. Whenever Cynthia is busy she has to bend, twist, and lift to put i

Help me am I correct?