CANDIDATE A
18-34 53.7%
35-64 37.3%
65+ 8.9%
CANDIDATE B
18-34 17.6%
35-64 47.1%
65+ 35.3%
Let a, b, c, d be coefficients for the balanced reaction:
a HC₂H₃O₂ + b KNO₂ → c KC₂H₃O₂ + d HNO₂
Count the elements among the reactants and products:
H: 4a = 3c + d
C: 2a = 2c
O: 2a + 2b = 2c + 2d
K: b = c
N: b = d
Suppose we let b = 1. Then both c = 1 and d = 1, and in the O equation we have
2a + 2 = 2 + 2 ⇒ 2a = 2 ⇒ a = 1
(Note that the equations for H and C also hold up.)
So the balanced reaction is simply
1 HC₂H₃O₂ + 1 KNO₂ → 1 KC₂H₃O₂ + 1 HNO₂
She has 6 kids (2 boys, 4 girls, since her total amount of kids is three times the amount of boys, 2 x 3 = 6 total)
4 girls : 2 boys
compare ratios with the answer choices.
4:2 =\= 4:8
4:2 =\= 8:6
4:2 =\= 6:9
4:2 = 12:6 ! When you multiply 4:2 by 3, you get 12:6.
I hope this helps!
Answer:
1.5 min
100 rotations
Step-by-step explanation:
to find 300 rotations time duration use the half-minute,
to find half of a minute divide the amount in one minute (200) by 2
200/2 = 100
then mutiply the 100 times 3 to find the time
100 * 3 = 300
therefore 30 sec (100 rot.) and 3 (3 times)
30 * 3 = 90
90 seconds minus 60 (one minute) is 30
so then it is equal to 1.5 minutes aka 1 min. 30 sec.
How long does it take to complete 300 rotations? 1.5 minutes (1 min. 30 sec.)
How many times does it rotate in a half minute? 100 rotations
hope this helps:)
