Question

Please help??
Graph the function y = 4(0.5)^x. Label the y-intercept and at least one point in each quadrant the graph passes through.

Answer 1

are you allowed a calculator?

Answer 2

yes

Answer 3

then pick some x values, and find the y values that go with them

btw, the y-intercept is the y you get when x is zero

what do you get for y when x=0
?

Answer 4

4

Answer 5

so write that down (0,4) is one point

try x=1 what is y ?

Answer 6

2

Answer 7

add (1,2) to your list

try x= 2, what is y ?

Answer 8

1

Answer 9

put (2,1) on your list

let's try x= 5
what is y ?

Answer 10

0.125

Answer 11

ok (5,.125)

if we keep going I think y gets closer to zero but never gets there

lets try x= -1

Answer 12

8

Answer 13

and x=-2 ?

Answer 14

16

Answer 15

so let's plot these points
(-2,16)
(-1,8)
(0, 4)
(1,2)
(2,1)
(5,0.125)

can you do that ?

Answer 16

Already done