Alex earns $20 each week, and he deposits half of it into his savings account. At the end of the year his parents add as much as he saved on his own. If the account has 15% simple interest, how much does he have in his account in one year?

Nine more than four times a number is the same as one less than twice the number. find the number?

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?