LovelyRock

Thank you! Do you know how to do #2?

Haven't done a problem like this in a while but from what I remember:

Find how many play 1 sport first

Basketball

Start with 17-8(baseball and basketball)-5(basketball and football)=4 students play just basketball

Baseball

Start with 21-8(both bballs) -6(football and baseball)=7 play just baseball

Football

Start with 24-6-5=13 play just Football

So far we have 13+7+4=24 students

Add that to the double sport players

24+8+5+6=43 students play sports

Another way is to take 21+17+24=6s and subtract the doubles

62-8-5-6=43

No Problem! I find it easier to do these problems when you know how many you are supposed to end with first. :) 

(6x+34)+(11x+10)=180

(6x+34)=z

17x+44=180

17x=136

x=8

6(8)+34=82 

z=82

q=quarters

n=nickles

q+n=13

.25q+.05n=2.45 (multiply by 100)

25q+5n=245

n=-q+13

25q+5(-q+13)=245 (Substition)

25q-5q+65=245

20q+65=245 (Substract 65 from both sides)

20q=180

q=9 

9+n=13

n=4

To check

.25(9)+.05(4)=2.45

The number of macaroons you need total is 36. This is found by multiplying 9 and 4, which is 36. 36-17=19 (You need to make 19 more macaroons).

\({x +17 \over 9}=4\)

\(x+17=36\) Subtract 17 from both sides
 

\(x = 19\)

If you mean \(3100000+170x^3xy\)

then you should get \(3100000+170x^4y\)

2.8333....