Answer:
im trying to figure out the same thing
Step-by-step explanation:

I'm not sure why ± that sybol isn't working
all together you can write

Ughh just ignore the "A" symbol .-.
Answer:
200 students must agree to attend in order for the school to have the festival.
Step-by-step explanation:
200 is 40% of 500. We can also use fractions to figure this out.

For 100 to become 500 it must be multiplied by 5. And whatever we do to the denominator we have to do to the numerator. So we multiply 40 × 5 = <em>x</em>
<em>x</em> = 200

132 is rounded to the 130 cause you just look at the last number and you see what is the closes zero that's why it is 130