I really need help with this question

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of