I'm pretty sure Cos(20°) = Sin(70°) Hope this helps :)
Meters are 100 times as large as centimeters. So, if we have 800 centimeters, that is the equivalent of 8 meters.
In this scenario, we want to know how many meters is equivalent to 7
centimeters. Since 1 centimeter is 1/100 of 1 meter, we can multiply the
amount of centimeters by 1/100 to get the measurement in meters.
7(1/100) will yield 7/100 or .07 meters.
To write this in scientific notation, we take 7 and multiply it by 1/100 or 10^(-2). This is written "7x10^(-2) m".
7 centimeters in scientific notation is just 7x10^0 because it is a
single unit. Scientific notation allows us to compare the size of
numbers more easily.
For instance 7.12x10^3 is much larger
than 7.12x10^(-3) due to the exponents and how many "10s" we are
mulitplying our number by.
If you are looking to write an inequality equation that models this situation, then the answer would be: 
. The "at most" signals to use the less than or equal to sign.
Center is at (h,k) in standard form:
(x-h)2 + (y-k)2 = r2
Center: (-8, -3)
Radius (r): sr49 = 7
