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Maru [420]
3 years ago
6

Combine like terms to simplify the expression: 9 + 3b − 1 + 7b − 2 =

Mathematics
2 answers:
yaroslaw [1]3 years ago
4 0
The answer would be 10b + 6
elena-s [515]3 years ago
3 0

Answer:

6+10b

Step-by-step explanation:

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I need help with this question​
Temka [501]

Answer:

It would be b I think

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A new medical test provides a false positive result for hepatitis 2% of the time that is a perfectly healthy subject being teste
Oxana [17]
Given that X <span>be the number of subjects who test positive for the disease out of the 30 healthy subjects used for the test.

The probability of success, i.e. the probability that a healthy subject tests positive is given as 2% = 0.02


Part A:

</span><span>The probability that all 30 subjects will appropriately test as not being infected, that is the probability that none of the healthy subjects will test positive is given by:

</span>P(X)={ ^nC_xp^x(1-p)^{n-x}} \\  \\ P(0)={ ^{30}C_0(0.02)^0(1-0.02)^{30-0}} \\  \\ =1(1)(0.98)^{30}=0.5455
<span>

Part B:

The mean of a binomial distribution is given by

</span>\mu=np \\  \\ =30(0.02) \\  \\ =0.6
<span>
The standard deviation is given by:

</span>\sigma=\sqrt{np(1-p)} \\ \\ =\sqrt{30(0.02)(1-0.02)} \\ \\ =\sqrt{30(0.02)(0.98)}=\sqrt{0.588} \\  \\ =0.7668
<span>

Part C:

This test will not be a trusted test in the field of medicine as it has a standard deviation higher than the mean. The testing method will not be consistent in determining the infection of hepatitis.</span>
5 0
3 years ago
Help please!!! I just seriously need help I'm bad at math&gt;
azamat
There is only 1 real number solution
8 0
3 years ago
Please solve this law of indices question
AnnyKZ [126]

Answer:

hope you understand .............

5 0
3 years ago
-45 divided by -9 .........
dmitriy555 [2]
5 because it’s a double negative which offsets the answer to be positive 5
7 0
3 years ago
Read 2 more answers
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