Joanna has a total of 50 coins in her purse. the coins are either nickels or quarters. the total value of the coins is $7.10.

which system of equations can be used to determine the number of nickels, n, and quarters, q, that joanna has in her purse?

a. n+q+50
0.05n+0.25q=7.10

b. n+q=7.10
50n+50q=7.10

c. 0.05n+0.25q=50
n+q=7.10

d. 0.05n+ 0.25q= 7.10
50n+50q=7.10

Option A.

Step-by-step explanation:

Let

n-----> the number of nickels

q----> the number of quarters

Remember that

we know that

----> equation A

-----> equation B

using a graphing tool-----> solve the system of equations

The solution is the point (27,23)

see the attached figure

therefore

The number of nickels is 27

The number of quarters is 23

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column