Rebecca has 45 coins, all nickels and dimes. the total value of the coins is $3.60. how many of each type of coin does rebecca have?

Rebecca have 18 nickels coins and 27 dime coins

Step-by-step explanation:

Remember that

1 nickel =$0.05

1 dime=$0.10

so

Let

x > the number of nickel coins

y > the number of dime coins

we know that

x+y=45

x=45-y > equation A

0.05x+0.10y=3.60 > equation B

Solve the system by substitution

Substitute equation A in equation B and solve for y

0.05(45-y)+0.10y=3.60

2.25-0.05y+0.10y=3.60

0.05y=3.60-2.25

0.05y=1.35

y=27

Find the value of x

x=45-y >x=45-27=18

therefore

Rebecca have 18 nickels coins and 27 dime coins

The surface charge density is .

Step-by-step explanation:

separation, d = 85 mm

Work, W = 6 x 10^-3 J

charge , Q = 8µC

The potential difference is given by

W = q V

Let the charge on he capacitor is q.