Answer: you could look it up or have a tutuar teach you to learn it
Step-by-step explanation:

Multiply the numerator and denominator by
:

Since
, we have
. So substituting the values of <em>a</em>, <em>b</em>, and <em>c</em> gives us

Answer:
124 boys and 161 girls
Step-by-step explanation:
There are 285 students total. Divide 285 by 2, you get 142.5. Since you can't have half a student, lets round it up to 143. Now, there are 19 more girls than guys, so you would subtract 19 from 143. When you do that, (143-19) you get 124. Then you take 285 and subtract 124. You get 161.
Hope this is correct!
Hey little miss. see image attached to help you