Lesson 6.1-6.4 review

-14x⁷/7x

• -2x⁶
• -2x
• -2x⁵
• -2x⁸

-3xy³ . (4xy)²

• -12x³y⁵
• -48x²y⁴
• -48x³y⁵
• -12x²y⁶

 $\left(\frac{-8p^{10}}{7r^3}\right)^{^2}$ 

• -64p²⁰/ 49r⁶

• 64p²⁰/ 49r⁶

• -8p²⁰/ 14r⁶

• -64p¹²/ 49r⁵

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• 
• 3x⁴y

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Does the graph represent an exponential growth or an exponential decay function?

• Exponential Growth
• Exponential Decay

Which of the following is an increasing exponential function whose y-intercept is 50?

• y = 50(.05)^x
• y = 50x - 4
• y = (2)^x + 50
• y = 50(1.4)^x

The amount of ants in a colony, f, that is decaying can be modeled by                      f(x) = 800(.87)^x, where x is the number of days since the decay started. By what percentage is the colony decaying?

• 87%
• 13%
• 800%
• 8.7%

A collectible car has been going up in price by 10% each year. If the car is already worth $29,000, how much will the car be worth in 5 years?

• $0.29
• $2,900,000,000
• $46,704.79
• $145,000

The expression 12(1.015)^t models the population of elephants in a wildlife refuge after t years since 1975.
Is the population of elephants increasing or decreasing?

• Increasing
• Decreasing

Is the graph exponential growth or decay?

• Exponential growth
• Exponential decay