Answer:
D. 20
Step-by-step explanation:
20% of 20 is 4
This is the way I do it to find the average.
10 girls times 70 = 700
15 boys times 80= 1200
700+1200=1900 all their scores
1900÷25 (number of boys and girls)=76 or 76%
a2+b2=c2
a=x
b=24
c=26
a2+24 squared=26 squared
a2+576=676
-576 -576
a2=100
Then, square root both sides.
It should be a/x=10
Answer: =296
Step-by-step explanation: −2*4=-8+20=28*3=84+48=132*2=164−2=162*4+20*3+48*2= 296
