y = 4 (2 Superscript x Baseline)

a.

On a coordinate plane, a curve approaches the x-axis in quadrant 2, and then increases through (0, 4) to quadrant 1.

y-intercept = 4

c.

On a coordinate plane, a curve approaches the x-axis in quadrant 2, and then increases through (0, 1) and (1, 2) to quadrant 1.

y-intercept = 1

b.

On a coordinate plane, a curve approaches the x-axis in quadrant 2, and then increases through (0, 2) to quadrant 1.

y-intercept = 2

d.

On a coordinate plane, a curve approaches the x-axis in quadrant 2, and then increases through (0, 1) and (0.5, 3) to quadrant 1.

y-intercept = 1