Algebra 1 Unit 4 Review

Harry Potter has 10,000 gold coins in his vault at Gringotts. Each week, he takes outs 850 gold coins for his expenses. Function g gives the remaining amount of gold coins as a function of the number of weeks, w, since Harry started taking out the gold coins. Solve the equation g(w) = 9150 and explain what the solution means in this situation.

• g(1) = 9150, After one week, Harry has 9150 gold coins remaining in his vault.

• g(9150) = 1, After 9150 weeks, Harry has 1 gold coin remaining in his vault.

• g(1)=9150, After one week, Harry has taken out 9150 gold coins from his vault.

• g(9150) = 1, After 1 year, Harry has taken out 9150 gold coins from his vault.

Functions X and Y give the number of first graders in School 1 and School 2, respectively, in year t. Which function value is greater X(2014) or Y (2014)?

• School 1

• School 2

• Neither, they are the same.

Functions X and Y give the number of first graders in School 1 and School 2, respectively, in year t. Identify all years in which X(t) = Y(t):

• t = 2013

• t = 2011

• t = 2015

• t = 2017

• t = 2018

• x = -2 and x = -6

• x = 2 and x = 6

• x = 3 and x = 4

• no solution

What does T(5) mean in this situation?

• The time it takes to go 100 miles against a 5 mph current

• The time is takes to go 5 miles against a 100 mph current

• It takes 5 hours to go the 100 miles against a 5 mph current.

• A boat rides sounds nice

At what value of c does the graph has a vertical asymptote? Explain how you know what this asymptote means in this situation?

• 12, if the current is going the same speed as the boat, the boat will not move

• 12, it means if speed of boat is 12 the current doesn't matter

• 100, it means the boat is going too fast

• No vertical asymptote, division by zero is fun, all the cool kids are doing it

Which color is the solution region to this system of inequaliteis?

• White

• Blue

• Purple

• Red

Solve by elimination:
9x-4y=7

x-4y=-17

• (-1,5)

• (-7,5)

• (7,5)

• (3,5)

Find the slope.

• -2/3

• 2/3

• -3/2

• 3/2