Exponential Review

What is the growth or decay rate for the following equation?
y = 2.5(1.15)^x

• -15% decay
• 115% growth
• 15% growth
• 25% growth

What is the growth/decay rate for the following table?

• 100% growth
• 50% growth
• 25% growth
• 25% decay

An adult takes 800 mg of ibuprofen. Each hour, the amount of ibuprofen in the person’s system decreases by about 29%. How much ibuprofen is left after 6 hours? 

• 101
• 102
• 103
• 104

The original value of a painting is $1400, and the value increases by 9% each year. Write an exponential growth function to model this situation.

• y=1400(1.09)^x
• y=1.09(1400)^x
• y=1400(.91)^x
• y=1.09^x

What is r, the decay rate, for the function: f(x) = 800(0.85)^x?

• 800
• 0.85
• 0.15
• x

What is b, the common ratio, for the function: f(x) = 300(1.16)^x?

• 300
• 1.16
• .16
• x

What is the asymptote of the function y=5(0.5)^x ?

• y=5

• y=0.5

• y=0

• y=1

 $f\left(x\right)=300\left(1.16\right)^x$  

What is a, the starting term, for the given function?

• 300

• 1.16

• .16

• x

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

• $y=15\cdot35^x$

• $y=15\cdot1.35^x$
  

• $y=15\cdot0.35^x$
  

• $y=35\cdot1.15^x$

Lucia mixed 5 pounds of cashews and almonds. Cashews cost $8 per pound and almonds cost $6 per pound. The total cost of Lucia's mixture was $33. How much of the mixture was almonds?

• 1.5 pounds

• 2.0 pounds

• 3.0 pounds

• 3.5 pounds