TEKS.MATH.9-12.VII.C

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

• y = 15(35)^x
• y = 15(1.35)^x
• y = 15(0.35)^x
• y = 35(1.15)^x

Tags

TEKS.MATH.9-12.VII.C

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

• y=5000(0.7)^x
• y=30(5000)^x
• y=5000(1.3)^x
• y=5000x^x

Tags

TEKS.MATH.9-12.VII.C

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

Tags

TEKS.MATH.9-12.VII.C

Write a equation:  A plumber charges $50 for a house call plus $12 per hour for labor.

• y = 50 x + 12
• y =12 x + 50
• y = 62 x
• x = 50 + 12y

Tags

TEKS.MATH.9-12.VII.C

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

• y=5000(0.7)^x
• y=30(5000)^x
• y=5000(1.3)^x
• y=5000x^x

Tags

TEKS.MATH.9-12.VII.C

A liquid is evaporating. The amount of a liquid remaining, in liters, after x weeks is modeled by the equation y = 100(0.78)^x.  Approximately what percent of the liquid evaporates per week?

• 22%
• 47%
• 53%
• 78%

Tags

TEKS.MATH.9-12.VII.C

A ball was launched into the air with an initial upward velocity of 100 ft/s. The ball was 5 ft off of the ground when it was launched.The equation for the ball is h(t)= -16t²+100t+5, approximately what is the maximum height?

• 3 feet

• 100 feet

• 161 feet

• 5 feet

Tags

TEKS.MATH.9-12.VII.C

A particular type of cell doubles in number every hour. Which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells?

• n= 4(1/2)^h

• n= 4(2)^h

• n= 4+ (2)^h

• n= 4 + (1/2)^h

Tags

TEKS.MATH.9-12.VII.C

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

Tags

TEKS.MATH.9-12.VII.C

Suppose that a bike rents for $4 plus $1.50 per hour. Write an equation in slope-intercept form that models this situation.

• y = 4x + 1.50

• y = 1.50x + 4

• y = -4x +1.50

• y = 4x - 1.50

Tags

TEKS.MATH.9-12.VII.C