Given a dilation where k=2, would the image be an enlargement or a reduction?

When eating out, record the total cost of your meal (before tip) and the tip that you left. determine the percent of the cost of the meal that you left as a tip.

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question