Mini Exam 30 — Timed Mini Exams

Questions in this quiz (10)

1. If $$12x-36=-6$$, what is the value of $$x-3$$?

   • $$-2$$
   • $$-\frac12$$
   • $$\frac12$$
   • $$2$$

2. $$A=3x^5-2x^2$$$$B=-3x^5-2x^2$$Which of the following is equivalent to the sum of $$A$$ and $$B$$?

   • $$0$$
   • $$-4x^2$$
   • $$6x^5$$
   • $$6x^5-4x^2$$

3. The graph above shows the amount of money, in dollars, that Jon earned on $$15$$ of the $$16$$ days he worked during the month of April. The money Jon earned on one of the two Sundays he worked is missing from the graph. The combined amount Jon earned on the two Sundays he worked was $$20$$ more than the combined amount he earned on the two Mondays he worked. How much did he earn on the Sunday that is missing from the graph?

   • $$65$$
   • $$70$$
   • $$75$$
   • $$80$$

4. In triangle $$ABC$$ above, what is the value of $$x$$?

   • $$30$$
   • $$40$$
   • $$50$$
   • $$60$$

5. A length of $$520$$ meters is equal to how many decimeters? $$(1\text{ meter}=10\text{ decimeters})$$

   • 5200

6. $$4x+6y=20$$$$y=-8$$If $$(x,y)$$ is the solution to the system of equations above, what is the value of $$x$$?

   • 17

7. The table above shows the number of students at High School A and High School B by grade. What fraction of the students in High School A are in the $$9$$th grade?

   • $$\frac{131}{276}$$
   • $$\frac{131}{567}$$
   • $$\frac{131}{1197}$$
   • $$\frac{276}{1197}$$

8. A ruby-bearing rock sample weighing $$1.36$$ metric tons was collected. On average, each metric ton of ruby-bearing rock yields approximately $$250$$ grams of rubies. At this rate, approximately how many grams of rubies will the $$1.36$$-metric-ton sample yield?

   • $$90$$
   • $$183$$
   • $$340$$
   • $$3,400$$

9. Jacqueline is planning to sell gumballs from machines she placed in front of $$4$$ stores at no cost. She spent $$520$$ dollars to purchase $$4$$ empty gumball machines and $$10,000$$ gumballs. Assume there is no tax. If Jacqueline sells each gumball for $$0.25$$ dollars, how many gumballs must she sell to receive an amount of money equal to her total initial cost for the $$4$$ empty gumball machines and the $$10,000$$ gumballs?

   • $$21$$
   • $$130$$
   • $$400$$
   • $$2,080$$

10. If $$a$$ > $$6$$, which of the following is equivalent to $$\frac{\frac{2}{a}}{\frac{1}{a-2}+\frac{1}{a-6}}?$$

    • $$2a^2-16a+24$$
    • $$a(2a-8)$$
    • $$\frac{a^2-8a+12}{a^2-4a}$$
    • $$\frac{2a-8}{a^2-8a+12}$$