Timed Mini Exam 28 — Timed Mini Exams

Questions in this quiz (10)

1. What is four times the difference between $$93$$ and $$68$$?

   • $$25$$
   • $$84$$
   • $$100$$
   • $$372$$

2. Which expression represents $$0.0000472$$ in scientific notation?

   • $$4.72\times10^{-4}$$
   • $$4.72\times10^{-5}$$
   • $$47.2\times10^{-5}$$
   • $$4.72\times10^5$$

3. A country has approximately $$326{,}000{,}000$$ mobile phones. If $$42\%$$ of the phones are owned by customers enrolled in family plans, how many phones are enrolled in family plans?

   • $$136{,}020{,}000$$
   • $$136{,}920{,}000$$
   • $$153{,}220{,}000$$
   • $$189{,}080{,}000$$

4. Solve the equation for $$x$$:$$4x-11=9x-36$$

   • $$-5$$
   • $$4$$
   • $$5$$
   • $$9$$

5. A line passes through $$(3,-2)$$ and is perpendicular to the line $$y=\frac{1}{2}x+7$$. Which equation represents the perpendicular line?

   • $$y=2x-8$$
   • $$y=-2x+4$$
   • $$y=-\frac{1}{2}x-\frac{1}{2}$$
   • $$y=\frac{1}{2}x-\frac{7}{2}$$

6. $$2x^2-7x-15=0$$What are the solutions of the quadratic equation?

   • $$-\frac{5}{2}$$ and $$3$$
   • $$-\frac{3}{2}$$ and $$5$$
   • $$\frac{3}{2}$$ and $$-5$$
   • $$3$$ and $$5$$

7. An organization surveyed $$40$$ randomly selected members about their preferred method of receiving announcements.Based on the survey, approximately how many of the organization’s $$6{,}000$$ members would be expected to prefer text messages?

   • $$900$$
   • $$1{,}050$$
   • $$1{,}800$$
   • $$2{,}250$$

8. The rectangular side of a piece of luggage has a diagonal length of $$26$$ inches and a height of $$10$$ inches. What is the width of this side of the luggage?

   • $$16$$ inches
   • $$20$$ inches
   • $$24$$ inches
   • $$36$$ inches

9. A restaurant purchases $$18$$ cans of peaches for $$\$5.50$$ each and $$22$$ cans of cherries for $$\$8.00$$ each. What is the average price per can, rounded to the nearest cent?

   • $$\$6.75$$
   • $$\$6.88$$
   • $$\$7.10$$
   • $$\$7.25$$

10. A student evaluates $$y=6x-4$$ when $$x=5$$ and obtains $$y=10$$. Which statement best explains the student’s error?

    • The student substituted $$4$$ for $$x$$.
    • The student added instead of subtracting.
    • The student subtracted before multiplying.
    • The student multiplied $$x$$ by $$4$$ instead of $$6$$.