zoe has a total of 16 coins. some of her coins are dimes and some are nickels. The combined value of her nickels and dimes is 1.35. How many nickels and dimes does she have?

Given:

In 16 coins some coins are dimes and some are nickels.

The combined value of her nickels and dimes is 1.35.

To find:

The number of nickels and dimes.

Solution:

We have,

Number of total coins = 16

Combined value = $1.35

Let x be the number of nickels and y be the number of dimes.

Total coins:              ...(i)

We know that,

1 nickel = $0.05

1 dime = $0.10

Combined value:          ...(ii)

From (i), we get

          ...(iii)

Putting this in (ii), we get

Divide both sides by -0.05.

Putting x=5 in (ii), we get

Therefore, the number of nickels is 5 and the number of dimes is 11.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

you save $70

discount would be 35% off

step-by-step explanation: