How does the graph of y = 2x compare to the graph of y = 2x + 4?

Which is the graph of the function y=2(4)^x

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?