Transcript August 25, 2011 Welcome to Ms. Wu`s math class!

Feb. 2
Ms. Wu thinks you’re smart. No really, I mean it. Ok, but smart
people still need to practice, so grade your homework already!
1) Get out HW 3.10 and start grading it.
2) Retrieve manila folder, adhere quicky quiz into notebook, and
correct if needed._________________________________
My expectation is that you have
already checked the odd-problems.
Mycoplasma bacteria
• a genus of bacteria
that lack a cell wall
(unaffected by many
antibiotics)
•One of the smallest
known cells
• the radius is about
.0000000125 m
• the radius of a red
blood cell is
.0000045m
Find the ratio of the radius of a red blood cell to the radius
of Mycoplasma bacteria. What does the ratio tell you?
Scientific Notation
• A number written in scientific notation is in the
form c x 10n, where 1 < c < 10 and n is an integer.
– Diameter of the solar system: 118,000,000,000 km.
– Diameter of a silver atom: 0.00000000000025 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.
Simplifying Exponents Practice
Solutions