单项选择题

For how many positive integers m≥100 is (m-5)(m-45) positive

A.45
B.50
C.58
D.59
E.60

相关考题

On the xy-coordinate plane appear four points-A, B, C a...

单项选择题On the xy-coordinate plane appear four points-A, B, C and D-which have (x, y) coordinates of (-2, -1), (4, -1), (-2, 3), and (3, 4) respectively.（）

A. if Quantity A is greater;
B. if Quantity B is greater;
C. if the two quantities are equal;
D. if you cannot determine the relationship based on the given information.