Ajar contains n nickels and d dimes. there are 20 coins in the jar, and the total value of the coins is $1.40. how many nickels and how many dimes are in the jar?

Answer : The number of nickel and dimes in the jar are, 12 and 8 respectively.

Step-by-step explanation :

As we are given that:

Number of nickels = n

Number of dimes = d

As, there are 20 coins in the jar. The equation will be:

       .........(1)

or,

    ............(2)

Total value of the coins is $1.40. The equation will be:

As we know that:

1 dime = $ 0.1

1 nickel = $ 0.05

So,

     ........(3)

Now put equation 2 in equation 3, we get:

Now put the value of 'n' in equation 2, we get:

Thus, the number of nickel and dimes in the jar are, 12 and 8 respectively.

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17