If 30 coins in quarters and dimes are worth $4.80, how many of each coin are there?

There are 18 dimes and 12 quarters

Step-by-step explanation:

Remember that

1 Dime =$0.10

1  Quarter=$0.25

Let

x> the number of dimes

y> the number of quarters

we know that

x+y=30

x=30-y > equation A

0.10x+0.25y=4.80

Multiply by 100 both sides

10x+25y=480 > equation B

Substitute equation A in equation B and solve for y

10(30-y)+25y=480

300-10y+25y=480

15y=180

y=12 quarters

Find the value of x

x=30-y=30-12=18 dimes

therefore

There are 18 dimes and 12 quarters

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

if i put something wrong your not gonna like it so rather not say nothing.