Which of the following is a perfect square trinomial? A. 4x^2 - 14xy + 25y^2
B. 4x^2 + 14xy - 25y^2
C. 4x^2 + 20 xy - 25y^2
D. 4x^2 - 20xy + 25y^2

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236

Which of these angles are supplementary? a. 100o and 90o b. 78o and 102o c. 54o and 146o d. 12o and 78o