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

see below

step-by-step explanation:

7.   there are 10 data points in the set.   the middle point is between 5 and 6.   the middle point in the top half is 8   and the middle point in the bottom half is 3. to find the iqr , take point 8 and subtract point 3

mid term   point 8 = 100   point 3 = 88

iqr = 100-88 = 12

final   point 8 = 93   point 3 = 78

iqr = 93 - 78 = 15

the final has the greatest iqr

6.   b - there is a high data value that causes the data set to be asymmetrical for the males: the data for males are high and asymmetrical .   there is an outlier for the males that skews the data

5.   the   iqr is a better measure of spread for the movies and basketball games.   since the basketball game has an outlier, we do not want to use standard deviation for measurement.  

3.   the exam median is much higher than the class median.   the median line is farther to the right on the exams

2.   there is no way to tell what the means are from the box and whisker plots.  

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.