Exponential Functions

The diagram shows the function f(x) = 3^x + 2. How could you name an ordered pair of this function.

• Option 1: Plug the function into the calculator and look at the table.

• Option 2: Randomly write down your favorite numbers.

• Option 3: Plug in zero for x, which gives an y output of 3 (1+2) for the point (0, 3)

• Option 1 and 3

• None of the above

Tags

CCSS.HSF-IF.C.7E

What is it about the equation y = 2(9/7)^x that indicates that it is a model for exponential growth?

• The equation is growth because 2 is positive.

• The equation is growth because the factor is positive.

• The equation is growth because the factor is greater than one.

• The equation is growth because the exponent is always positive.

Tags

CCSS.HSF-IF.C.8B

Consider the equation y=200(1.08)^x which models the increase in value of an autographed Annie program. Let y = the value of the item, let x = the number of years since the performance. What does the 1.08 in the equation indicate?

• The value of the item is increasing by $1.08 each year.

• The value of the item is increasing by 1.08% each year.

• The value of the item will increase to $200 1.08 years after purchase.

• The value of the item is increasing by 8% each year.

Tags

CCSS.HSF.LE.B.5

What is an asymptote?

• A special bag used by hikers and athletes to carry valuables.

• an imaginary vertical line that helps define the reflection of a graph.

• an imaginary horizontal line that helps define where the graph will approach, but never reach.

• another term for vertical intercept.

Tags

CCSS.HSF-IF.C.7D

How can you find the vertical intercept of a graph?

• Option 1: Enter the function into the calculator and look for the value of y where x is zero.

• Option 2: Plug in zero for x (easy mental math because anything raised to the zero power is one) and calculate y.

• Option 3: Use the trace feature on the calculator.

• Options 1, 2, 3

• None of the Above.

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CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

If you were asked to write an exponential function with an asymptote of y = - 2, what must you include in your equation?

• Subtract 2 from any exponential expression. Ex. y = (4)^x - 2

• Add 2 to any exponential expression. Ex. y = (4)^x + 2

• Raise the expression to the power of -2. Ex. y = x ^-2

• Subtract .02 from 1 to get a decay factor. Ex. y = (1 - .02)^x

Tags

CCSS.HSF-IF.C.7E

A population of mutant venus fly trap plants are taking over an island in the South Pacific, capturing everything from insects to small rodents. When they were first discovered they covered 4 square kilometers. As the population grows, the plants spread and cover more land. Use the table to write an equation.

• y=4(4)^x

• y=4(2.68)^x

• y=4(1+1.67)^x

• y=4(1.67)^x

Tags

CCSS.HSF.LE.A.2

A population of mutant venus fly trap plants are taking over an island in the South Pacific, capturing everything from insects to small rodents. When they were first discovered they covered 4 square kilometers. As the population grows, the plants spread and cover more land. How many years will it take for the plants to occupy 400 km²?

• 8 years

• 9 years

• 10 years

• 11 years

Tags

CCSS.HSF.LE.A.2

CCSS.HSF.LE.A.1

CCSS.HSA.CED.A.1

CCSS.HSA.SSE.A.1

CCSS.HSF.BF.A.1

CCSS.HSF.IF.B.4

You are sick and your doctor prescribes a medication. One dose is 200 mg. Every half hour 30% of the medication leaves the body. If you take the first dose at 6 am, how many events/intervals have occurred by 9 am?

• 3

• 6

• 30

• 90

Tags

CCSS.HSF.BF.A.2

You are sick and your doctor prescribes a medication. One dose is 200 mg. Every half hour 30% of the medication leaves the body. You take the first dose at 6 am. If y = amount of medication in the body and x = a 30 minute interval, what equation fits the scenario?

• y=30(0.70)^x

• y=200(0.30)^x

• y=200(x)^0.3

• y=200(0.70)^x

Tags

CCSS.HSF.LE.A.2