How do you do this ?

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

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?