From the top of a tree 30 m height a man is observing the base of a tower at an angle of depression measuring 30 degree. Find the distance between the tower and the tree.

Each morning papa notes the birds feeding on his bird feeder. so far this month he has see. 59 blue jays, 68 black crows, 12 red robin's and 1 cardinal. what is the probability of a blue jay being the next bird papa sees

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?