Which function has a range of y < 3?
a. y=3(2)^x
b. y=2(3)^x
c. y=-(2)^x+3
d. y=(2^x)-3

Using a graphing tool

Let's graph each of the cases to determine the solution of the problem

case A)  

see the attached figure N

The range is the interval--------> (0,∞)

therefore

the function is not the solution

case B)

see the attached figure N  

The range is the interval--------> (0,∞)

therefore

the function is not the solution

case C)  

see the attached figure N    

The range is the interval--------> (-∞,3)  

therefore

the function      is the solution

case D)  

see the attached figure N  

The range is the interval--------> (-3,∞)  

therefore

the function is not the solution

the answer is

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.