Writing equations of exponential functions

Which equation describes the story below?

You start with $5 and triple your money every day.

• y=5(3)^x

• y=5^x

• y=5(3x)

• y=15^x

What is the y-intercept and base of f(x) = 4(2)^x ?

• y-int: (0,4)
  
  base: 2

• y-int: (4,0)
  
  base: 2

• y-int: (2,0)
  
  base: 4

• y-int: (0,2)
  
  base: 4

• y-int: (0,3/4)
  
  base: 8

• y-int: (0,8)
  
  base: 3/4

• y-int: (8,0)
  
  base: 3/4

• y-int: (3/4,0)
  
  base: 8

• y-int: (0,3)
  
  base: 5/2

• y-int: (3,0)
  
  base: 5/2

• y-int: (5/2,0)
  
  base: 3

• y-int: (0,5/2)
  
  base: 3

Given the y-intercept and base of an exponential function, identify the equation that represents it.

y-int: (0,1)

base: 2.5

• f(x) = 2.5x + 1

• f(x) = 1x + 2.5

• f(x) = 1(2.5)^x

• f(x)= 2.5(1)^x

Given the y-intercept and base of an exponential function, identify the equation that represents it.

y-int: (0,1/2)

base: 3

Given the y-intercept and base of an exponential function, identify the equation that represents it.

y-int: (0,9)

base: 2

• f(x) =  2x + 9

Given the y-intercept and base of an exponential function, identify the equation that represents it.

y-int: (0,4)

base: 3

• f(x) =  3x + 4

Solve for the value of x.

1100 = 11x²

• x=100

• x=5

• x=11

• x=10

• 2

• 4

• 8