Given the sequence 1, 9, 25, 49, 81, find the explicit formula. a. an=(2n−1)2an=(2n−1)2 b. an=n2−1an=n2−1 c. an=−4n+2an=−4n+2 d. an=−2n+2

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a