What is 3 1/2 + 3/4 =

Mathematics

1 answer:

spayn [35]3 years ago

8 0

It’s 4.25 or 4 1/4
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Josie simplified an expression as shown below. In which step did Josie make mistake(s)?

Andreas93 [3]

Answer:

D. Step 1 only.

Step-by-step explanation:

Here, Josie didn't use the distributive property correctly. The other two steps are still right, so D is correct.

How it should have been done:

x + 3 + 7x(x - 5)

<em>Use the distributive property to multiply 7x by x - 5.</em>

x + 3 + 7x² - 35x (The boldened part is what should have happened for Step 1)

<em>Combine x and -35x to get -34x.</em>

7x² - 34x - 3 is what the earlier equation should be simplified to.

6 0

3 years ago

The National Center for Health Statistics (NCHS) reports that 70%70% of U.S. adults aged 6565 and over have ever received a pneu

Marianna [84]

Answer:

11.44% probability that exactly 12 members of the sample received a pneumococcal vaccination.

Step-by-step explanation:

For each adult, there are only two possible outcomes. Either they received a pneumococcal vaccination, or they did not. The probability of an adult receiving a pneumococcal vaccination is independent of other adults. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$