<span>B) A key chain can hold 3 keys. If there are a total of 12 keys, how many key chains are there?</span>
Answer:
bc
Step-by-step explanation:
2:9 is equivalent to
18: 81 because is 2*9 : 9*9
12:54 because is 2*6 : 9* 6
Answer:
1920 ft^3
Step-by-step explanation:
Split it in 2.
14*8*10 and 10*10*8
14*10*8 = 1120
10*10*8 = 800
800 + 1120 = 1920
Suppose:
C=cost
c=cost per kilo-watt hour
w=number of watts
h=number of hours
thus
C=kwhc
where:
k=constant of proportionality:
k=C/(whc)
but
C=15 when w=6000, h=10/60=1/6 hours, c=7.5 cents per kw/h
thus
k=15/(6000*1/6*7.5)
k=0.002
thus:
C=0.002(whc)
hence:
when
h=70*2=140=140/6=70/3 hours the cost will be:
C=0.002(6000*70/3*7.5)
C=2100 cents
C=$21
