If 0.3 = 1 then 0.9 = 3 because 0.3+0.3+0.3=the 3.
1 part sugar : 4 parts water
3/4 cup of sugar.
1:4 = 3/4 : x
x = 4 * 3/4
x = 12/4
x = 3 part water
C. 7.2°F is warmer than 7.0°F but colder than 7.6°F.
The derivative of at a point in the direction of a vector is
We have
and
Then the derivative at in the direction of is