Patanna bought some red and blue bricks. She bought a total or 100 bricks. The red bricks cost $5 each and the blue bricks cost $7 each. She spent a total of $560. How many red bricks and how many blue bricks did she buy?

Let...

x=the number of red bricks

y=the number of blue bricks

Since she bought a total of 100 bricks... x+y=100.

Because the total cost is $560... 5x+7y=560.

Using these two equations, we can use the substitution method to solve for x and y.

x+y=100 > x=100-y

        subtract y on both sides

Because x=100-y...

                                                                  this is x

5x+7y=560 (second equation) equals 5( 100 - y )+7y=560  

This equation we created has only one variable so we can solve it.

5(100-y)+7y=560

500-5y+7y=560

2y+500=560

2y=60

y=30 blue bricks

Because x=100-y... x=100-30=70 red bricks.

the answer is true.

step-by-step explanation:

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.