2.5 Modelling with functions Quiz

1. A plumber charges 60 AED plus 35 AED per hour, so $C(h)=60+35h$. Find the cost of a job lasting 3.5 hours.

• A. $95$ AED
• B. $122.5$ AED
• C. $182.5$ AED
• D. $210$ AED

2. Find the equation of the axis of symmetry of $f(x)=2x^2-12x+5$.

• A. $x=-3$
• B. $x=3$
• C. $x=6$
• D. $x=-6$

3. What is the equation of the horizontal asymptote of $f(x)=5e^{-0.3x}+4$?

• A. $y=0$
• B. $y=5$
• C. $y=9$
• D. $y=4$

4. The time $T$ for a job varies inversely with the number of workers $n$. Six workers take 48 hours. How long do 8 workers take?

• A. $36$ hours
• B. $64$ hours
• C. $6$ hours
• D. $288$ hours

5. Find the period of $f(x)=4\sin(60x^\circ)+1$.

• A. $60^\circ$
• B. $360^\circ$
• C. $6$
• D. $4$