Hi, I'm struggling with y1(t), can somebody help me?

What is the y-intercept of the graph of the equation y=3(2^x)

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg