Answer:
It could by any 2 numbers that satisfy a^2+b^2= 20.
One example would be 4 and 2:
4^2+2^2=16+4=20
I hope this helped.
#7 is 6/8 im not sure about #6
Answer:
I have made it in above figure
A) D + Q = 15
B) .10 D + .25Q = 2.85
Multiplying equation A by -.10
A) -.10 D -.10 Q = -1.5 Then adding this to B)
B) .10 D + .25Q = 2.85
.15Q = 1.35
9 Quarters
and if there are 15 coins there are 6 dimes