An angle supplementary to 25 can be 6
The answer is <span>c. 25
</span>
<span>sin(ϴ + 15) = cos(2ϴ)
</span>sin(ϴ + 15) =sin(25 + 15) =<span>sin(40) =0.64
</span>cos(2ϴ)=cos(2x25)=<span>cos(50)=0.64
</span> so <span>ϴ=25</span>
F - because you must move the decimal place 9 spaces to the left in order to have only a single digit in front of the decimal place. (There can never be more than one otherwise it is no longer scientific notation.
There is a formula for this
Time = [Worker 1 * Worker 2] / [Worker 1 + Worker 2]
Time = 30*40 / (30+40)
Time = 1,200 / 70
Time =
<span>
<span>
<span>
17.1428571429
</span>
</span>
</span>
minutes
Alternate method
In 1 minute, Mark can clean (1/30) of a room
In 1 minute, Lynn can clean (1/40) of a room
Together, they can clean (1/30 + 1/40) = (7 / 120) of a room in 1 minute.
Together, they can clean one room in (120 / 7) minutes.
(120 / 7) =
<span>
<span>
<span>
17.1428571429
</span>
</span>
</span>
minutes.
Source:
http://www.1728.org/work.htm
So first Pedro gets $42
then Tessa gets <u>x</u> dollars mowing.
And it says Pedro gets 3 times as much as Tessa
therefore the equation shall be>>>>>> x∙3=$42
Now we do: 42 / 3 = 14
<em>X= 14</em>
Hope u understand. Stay safe QT! (Also sorry it took me a while i put effort in trying to explain It, in the best way possible)
