Whats 7x6-6x11-66+55?

Math help please will mark brainliest

Musya8 [376]

Answer:

answer: positive 3

Step-by-step explanation:

when x=-2 y=3

3 0

3 years ago

A group of 5th graders went on a trip. Some of them had bikes and some did not. The ones without bikes left at 9:00 AM, walking

In-s [12.5K]

If the walkers start at nine and want to join the cyclists at noon, they will have been walking for 3 hours. At 5 km/h, they would have walked for 15 km. The cyclists can travel 15 km at 12 km/h in 1.25 hours. Therefore, the cyclists can start their journey at 10:45 am.

3 0

3 years ago

Please help me i dont understand

irina [24]

Answer:

3x + 4

Step-by-step explanation:

We have a product of 3 and x. That's rewritten as 3x. We then have 4 more, so we add 4. That gives us the final answer of: 3x+4. (It is 1-4x for the third one). ( The fourth one) The sum of seven and the quotient of a number x and eight

Here, x be the number.

" quotient of a number x and eight" translated to x/8

Sum means '+'

"sum of seven and the quotient of a number x and eight" translated to 7+ x/8 +56+x/8

then; the given statement is 56+x/8

⇒

Therefore, the given statement is 56+x/8

6 0

4 years ago

In a study, 42% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people

kobusy [5.1K]

Answer:

The probability that when 11 adults are randomly selected, 3 or fewer are in excellent health is 0.6483.

Step-by-step explanation:

The random variable X can be defined as the number of adults questioned reported that their health was excellent.

A random sample of n = 11 adults are selected randomly selected from an area a nuclear power plant.

Of these 11 adults X = 3 reported that their health was excellent.

The proportion of adults who reported that their health was excellent is:

$p=\frac{X}{n}=\frac{3}{11}$

An adult's health condition is not affected by others, i.e. they are independent.

The random variable X follows a Binomial distribution with parameters n = 11 and p = $\frac{3}{11}$ .

The probability mass function of X is:

$P(X=x)={11\choose x}(\frac{3}{11})^{x}(1-\frac{3}{11})^{11-x};\ x=0,1,2,3...$

Compute the probability that when 11 adults are randomly selected, 3 or fewer are in excellent health as follows:

P (X ≤ 3) = P (X = 0) + P (X = 1) + P (X = 2) + P (X = 3)

$=\sum\limits^{3}_{x=0}{{11\choose x}(\frac{3}{11})^{x}(1-\frac{3}{11})^{11-x}}\\=0.02998+0.12385+0.23254+0.26197\\=0.64834\\\approx 0.6483$

Thus, the probability that when 11 adults are randomly selected, 3 or fewer are in excellent health is 0.6483.

5 0

3 years ago

One-half of Heather's age 2 years from now plus one-third of her age three years ago is twenty years. How old is she now?

viktelen [127]

She is 24
24+2=26
26(1/2)=13
13+((24-3)1/3)
13+(21*1/3)
13+7=20
Therefore she is 24

4 0

3 years ago