What is the value of y

Me asap on # : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

[tex]5 \times1 \frac{12}{13} [/tex] me

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25