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xz_007 [3.2K]
2 years ago
9

Help, is this correct?

Mathematics
1 answer:
Ronch [10]2 years ago
4 0

Answer:

Yes good job!

Step-by-step explanation:

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Mrs.Hernandez told her class that 95% of the students in the class passed the math test if there are 20 students in the class ho
disa [49]

Answer:

19 people passed

Step-by-step explanation:

19 people passed the test

6 0
2 years ago
two pumps of different sizes, working together, can empty a fuel tank in 3 hours. the larger pump can empty the tank in 4 hours
bonufazy [111]
Suppose the larger pump alone can empty the tank in L hours, and the smaller pump can finish the job in S hours, then each hour the large pump empties 1/L portion of the tank, and the small pump empties 1/S per hour
Working together for three hours, they empty the whole tank, which is 100% of it, so 3/L+3/S=100%=1
Larger pump can empty the tank in 4 hours less than the smaller one, so L=S-4
replace L: 3/(S-4)+3/S=1
Make the denominator the same to solve for:
3S/[S(S-4)] +3(S-4)/[S(S-4)]=1
(3S+3S-12)/[S(S-4)]=1
(3S+3S-12)=[S(S-4)]
S^2-10s+12=0
use the quadratic formula to solve for S
S is about 8.6
The answer is not whole hour. 


8 0
3 years ago
Read 2 more answers
PLEASE HELP FAST pleaaaaaaaaaaaaaaaaaaaaaaase
Eduardwww [97]

Answer:

i think the answer is C. 1.5w^2 + 7.5w + 9

6 0
2 years ago
The price of a car devaluated from 3500 to 2700 what is the percent of decrease of the car
Nata [24]

Answer:

The price of the car decrease 22.86 %

Step-by-step explanation:

(3500-2700) / 3500 = 0.22857 *100%

3 0
3 years ago
Read 2 more answers
True or false - A risk ratio and an odds ratio are different names for the same concept
aalyn [17]
True would be right
6 0
2 years ago
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