Quotient of a number and 10 is added to 1/5 the result is 11/10 find the number

Me. i can't figure out this question. give an explanation too. .

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

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.