02.02.12_02.03.12: +/-/x/÷ in Scientific Notation
1. Reminder about Unit 3.1 test corrections. Notify me by Mon, 2/6, if want to re-take (must show me completely
correct test) and can re-take on Wed for up to a 90% (re-take score overrides first score).
2. No warm up.
3. Grade HW 3.10 on Exponent Rules, Pt. 2.
4. Return and review QQ on SOI
5. Review “break even pt” question on 3.1 Test for P1
6. +/-/x/÷ in Scientific Notation
a. Intro about mycoplasma bacteria
b. The radius is .0000000125m =1 .25 x 10 -8 meter
c. The radius of a red blood cell is .0000045m = 4.5 x 10 -6 meter
 Find the ratio of the radius of a red blood cell to the radius of Mycoplasma bacteria. What does the ratio tell
you?
o
4.5 x 10 −6 meter
1.25 x 10 −8 meter
= 3.6 x 102 = 360; the radius of the rbc is about 360 times that of the Mycoplasma
bacteria
o
Fun fact: A micrometre (or micrometer), is by definition 1×10-6 of a metre (SI Standard prefix "micro"
= 10-6). In plain English, it means one-millionth of a metre (or one-thousandth of a millimetre, or
0.001 mm). Its unit symbol in the International System of Units (SI) is μm. The latter may be rendered
as um if Greek fonts are not available or not admissible. "Micron" comes from the Greek word "μικρόν",
which means small.
o
The term micron and the symbol μ, representing the micrometre, were officially accepted between 1879
and 1967, but officially revoked by the ISI in 1967.[1]

A number written in scientific notation is in the form c x 10n, where 1 < c < 10 and n is an integer.
o Diameter of the solar system: 118,000,000,000 km. = 1.18 x 1011 km.
o Diameter of a silver atom: 0.00000000000025 km. = 2.5 x 10-13 km.
 Try it out: The speed of light is 3 x 10 8 meters/second. If the sun is 1.5x 1011 meters from earth, how many
seconds does it take light to reach the earth? Express your answer in scientific notation.
o 5 x 102 sec. = 500 sec. = about 8.3 minutes
 Demonstrate how sci. not. looks like on graphing calculator and practice exponentiating
7. If have time, do additional exponent practice.
8. Quicky Quiz
9. Unit 3.2 quiz is scheduled for 2/10 (R) and 2/13 (P); still left to cover: exponential growth and decay/exponential
functions/ advanced exponents
a. Area of shapes using polynomials
b. Then on to parabolas
10. HW: Practice with Scientific Notation
11.