Leon has 4 boxes. each box has 15 golf balls and 12 tennis balls.
which expression shows the total number of balls leon has in the boxes?
a. 4 × 12 × 4 × 15
b. 4 + 12 + 4 + 15
c. (4 × 15) × (4 × 12)
d. (4 × 15) + (4 × 12)

Two groups of students were asked how many hours they spent reading each day. the table below shows the numbers for each group: group a 1 2 1 1 3 3 2 2 3 group b 3 2 3 2 2 2 1 1 2 based on the table, which of the following is true? the interquartile range for group a students is 0.5 less than the interquartile range for group b students. the interquartile range for group a students is equal to the interquartile range for group b students. the interquartile range for group a employees is 0.5 more than to the interquartile range for group b students. the interquartile range for group a employees is 1 more than the interquartile range for group b students.