A30% increase followed by a 15% decrease, is it greater than original, smaller or same as

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)