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alukav5142 [94]
3 years ago
8

36x - 63 = k(4x - 7) Need help, I dont know what im doing wrong here

Mathematics
1 answer:
ozzi3 years ago
6 0

Answer: k= 9

x= 7/4

Step-by-step explanation:

https://www.symbolab.com/solver/order-of-operations-calculator/36x%20-%2063%20%3D%20k%5Cleft(4x%20-%207%5Cright)

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Only about 75% of all donated human blood can be used in hospitals. The remaining 25% cannot be used because of various infectio
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Answer:

a) 0.02739

b) 0.00034

Step-by-step explanation:

If it is believed that at least 6 of the 10 pints are usable, then the 75% of “good” pints that can be used from this sample reduces to 60% of 75% = 0.6*0.75 = 0.45

Now for this sample we use a binomial distribution with probability of “success” (finding a “good” pint) of 0.45% and

the probability of getting exactly r good pints out of 10 is  

\bf \binom{10}{r}0.45^r(1-0.45)^{10-r}=\binom{10}{r}0.45^r0.55^{10-r}

where

\bf \binom{10}{r} are combinations of 10 taken r at a time.

a)

The probability that at least 8 of the pints are usable is P(r>7)

\bf \binom{10}{8}0.45^80.55^2+\binom{10}{9}0.45^90.55^1+\binom{10}{10}0.45^{10}0.55^0=\\0.02289+0.00416+0.00034=0.02739

b)

Here we want P(r=10)

\bf \binom{10}{10}0.45^{10}0.55^0=0.00034

7 0
4 years ago
A 30inch piece of wood is 3% of a longer piece of wood. How long is the longer piece of wood?
Shtirlitz [24]

Answer:

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Step-by-step explanation:

if 30in is 3% of the longer wood, then 1% would be 10in. 10 times 100 is 1,000.

4 0
3 years ago
Add
dlinn [17]

Answer:

Answer: 37/100 (B)

Step-by-step explanation:

3/10 + 7/100 = 30/100 + 7/100 = 37/100

First convert 3/10 to 30/100 (Multiply both numerator and denominator by 10). Then add.

Answer: 37/100 (B)

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