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

A population of fish starts at 8,000 and decreases by 6% per year. What is the population of fish after 10 years?

• 14327
• 4309
• 839
• 7680

Tags

TEKS.MATH.9-12.VII.C

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x
• y=84x
• y=7/3x
• y=3/7x

Tags

TEKS.MATH.9-12.VII.C

An object in launched directly upward at 64 feet per second (ft/s) from a platform 80 feet high. Its height is represented by the equation 
s(t) = –16t² + 64t + 80.
What will be the object's maximum height? 

• 2 ft
• 80 ft
• 144 ft
• 64 ft

Tags

TEKS.MATH.9-12.II.C

TEKS.MATH.9-12.VII.C

The sequence below shows the amount of bacteria that occurs after each hour:   2, 6, 18, 54, 162 Which formula can be used to determine the amount of bacteria in the next hour, NEXT, if the number of NOW bacteria is known?

• NEXT = NOW ⋅ 3
• NEXT = NOW ⋅ ⅓
• NEXT = 3 ⋅ NOW + 2
• NEXT = NOW ÷ 3

Tags

TEKS.MATH.9-12.VII.C

If Distance is a function of Time, what is the average rate of change from 6 to 9 seconds?

• 3.3 feet per second
• -10 feet per second
• -3.3 feet per second
• 10 feet per second

Tags

TEKS.MATH.9-12.VIII.A

TEKS.MATH.9-12.VII.C

Sonia has $40 in her lunch account and pays $2 each day to eat lunch.

• y = 40 + 2x

• y = 40 - 2x

• y = 2 + 40x

• y = 2 - 40x

Tags

TEKS.MATH.9-12.VII.C

Rafael drops a ball from a third-story window. This equation represents the approximate height, h, in meters, of the ball above the ground after it falls for t seconds.

h = -5t² + 45

When is the ball at ground level?

• only at t = 0 seconds

• only at t = 3 seconds

• only at t = 9 seconds

• at both t = 0 seconds and t = 3 seconds

Tags

TEKS.MATH.9-12.VII.C

Bob's Plumbing charges $15 per hour plus a service fee of $40 for coming out to your house. Which equation models this situation?

• y = 15x + 40

• y = 40x + 15

• y = 15x

• y = 15x - 40

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