Answer:
Step-by-step explanation:
473
346+264=610
610-137=473
x=20
4x +10 = 90
-10 from both sides
that gives you 4x=80
80 divided by 4 gives you 20=x
275
4/21
since we are only talking about the first day, there are still 21 options for your teachers. there are 4 spots that you can fill, so the probability that you will be picked is 4/21
