SparklingWater2

every 3 minutes they double, so they double 5 times, or they're population is multiplied by 2^5 or 32. so 20$\cdot$32=$\boxed{640}$

1.-y + 2 = y

2y = 2

y = 1

2. 5x - 2 = x + 6

4x = 8

x = 2

3. -2y + 1 = y - 5

3y = 6

y = 2

4. UNSOLVABLE

5. x = 50+15

x = 65

6. 3x = x + 4

2x = 4

x = 2

1. 180-(90-60+90)=angle ACD=$\boxed{60}$

2.

inequalities that limit our answers:

3+5>CA

3+CA>5

5+CA>3

largest possibility for CA:7

smallest possibility for CA:3

total possibilities for CA: $\boxed{5}$

3.

l/2$\cdot$l=50

l^2=100

l=10

10$\cdot$4=$\boxed{40}$

there are 13 marbles to choose from the first time, and 12 marbles to choose from the second time, so 156 options in total, and there are 6$\cdot$5=30 ways to choose red each of those times, so 30/156=$\boxed{\frac{5}{26}}$

the hour hand traveled 1/4 of the circumference of the circle with 6 inches as a radius, which is 12$\pi$/4=3$\pi$, where the minute hand traveled the whole circumference of the circle with radius 8 inches 3 times, which is 16$\pi\cdot$3=48$\pi$

so the ratio is 3$\pi$:48$\pi$, and simplified: $\boxed{1:16}$

p+5n+10d+25q=287

q=2n-1

p=n+4

d=2p

substitution:

d=2n+8

n+4+5n+20n+80+50n-25=287

76n+59=287

76n=228

n=$\boxed{3}$

q=$\boxed{5}$

p=$\boxed{7}$

d=$\boxed{14}$

The first person pays (2200-2200x40/100)-(2200-2200x40/100)x25/100=(2200-880)-(2200-880)x1/4=1320-330=$\boxed{\$990}$\

The second person pays 2200-2200x40/100=$\boxed{\$1320}$

the second customer pays 1320-990=$\boxed{\$330}$ more.

15x80/100=15x4/5=12

30%=12

10%=4

100%=$\boxed{40}$

125/125=1

1%=1

100%=$\boxed{100}$people

82% calls picked up 8/100x82/100=656/10,000=41/625

so the proportion is $\boxed{\frac{41}{584}}$