An orchard has 4 rows of apple tree with 12 trees in each row. there are also 6 rows of pear trees with 15 trees in each row. how many apple and pear trees are in the orchard

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Robert has 78 tomato lants and 56 cucumber plants .he wants to plant them in rows that only have one type of plant in each row with the same number of plants in each row. how many plants should he put in each row and how many rows of each type of plant will he need

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)