Each coin has an equal probability of coming up heads or tails, so the probability of tails for each coin is ½. For two coins, the probability is ½ x ½ , or 1 in 4.
Let p = ‘Tom is a good teacher.’ Let q = ‘Tom cares about his students.’ The given statement says: If p, then q. The contrapositive, which is also true, says: If not q, then not p. Thus, if Tom does not care about his students, Tom is not a good teacher.
(7,x) represents the eighth point in this sequence. Thus, the corresponding x value equals 3 x 8, or 24.
The area of a parallelogram is equal to Base x Height. The height cannot be determined just by measuring the length of the four sides. More information is required.
The interior angles of any quadrilateral add up to 360 degrees. The other choices are only true of certain quadrilaterals.