Functions With Equation

If f(x)=5x+1,

then f(3)=

If f(x)=10x+5,

then f(1)=

If f(x)=10x+5,

then f(2)=

If f(x)=10x+5,

then f(3)=

If f(x)=x+3,

then f(4)=

d=125 + 80n models the amount of money (d) in the register after selling n tickets. What is the meaning of 80 in the equation? 

• The price of each ticket is $80

• 80 tickets have been sold

• There was $80 dollars in the register before any tickets were sold

• There are only 80 tickets that can be sold

Write the equation in point-slope form of the line that passes through the given point and has the given slope:

(-2, -1); m= -3

• y + 1 = -3(x - 2)

• y + 1 = -3(x + 2)

• y - 1 = 3(x - 1)

• y + 2 = -3(x + 1)

• y = 9x² - 15x + 21

• y = -3x² - 75x - 4

• y = 9x² + 90x + 221

• y = -3x² - 30x - 79

Which equation is represented by the table?

• y = 40(2)^x

• y = 40(1/2)^x

• y = 40 - 2x

• y = 40 - 1/2x

Write an equation that models the following situation:
Samantha's hair was known to grow very rapidly. It began at a length of 6 in and grew at a rate of 14% a week.

• y=6(0.14)^x

• y=6(1+14)^x

• y=6(1.14)^x

• y=6(0.86)^x