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4 years ago

Subtract the expression : - 5x + 3x - 24 Plzz ....answer....plzzz

Mathematics

2 answers:

prisoha [69]4 years ago

8 0

Answer:

-2x-24 hope dis helped

Afina-wow [57]4 years ago

4 0

Answer:

-2x-24

Step-by-step explanation:

-5x+3x-24 = - 2x-24

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A random sample of 64 students at a university showed an average age of 20 years and a sample standard deviation of 4 years. The

adelina 88 [10]

Answer:

The 90% confidence level is $19.15< L < 20.85$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 64$

The mean age is $\= x = 20 \ years$

The standard deviation is $\sigma = 4 \ years$

Generally the degree of freedom for this data set is mathematically represented as

$df = n - 1$

substituting values

$df = 64 - 1$

$df = 63$

Given that the level of confidence is 90% the significance level is mathematically evaluated as

$\alpha = 100 - 90$

$\alpha =$ 10 %

$\alpha = 0.10$

Now $\frac{\alpha }{2} = \frac{0.10}{2} = 0.05$

Since we are considering a on tail experiment

The critical value for half of this significance level at the calculated degree of freedom is obtained from the critical value table as

$t_{df, \frac{ \alpha}{2} } = t_{63, 0.05 } = 1.669$

The margin for error is mathematically represented as

$MOE = t_{df , \frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

substituting values

$MOE = 1.699 * \frac{4 }{\sqrt{64} }$

$MOE = 0.85$

he 90% confidence interval for the true average age of all students in the university is evaluated as follows

$\= x - MOE < L < \= x + E$

substituting values

$20 - 0. 85 < L < 20 + 0.85$

$19.15< L < 20.85$

4 0

3 years ago

X squared = −169. A= undefined B= 13 C= ±13 D= −13

mash [69]

Answer:

A. Undefined.

Step-by-step explanation:

There is no real square root of a negative number.

7 0

3 years ago

Of the 85% of the students in a class who studied for a test,75% passed the test.Of the 15% of the students who didn't study,30%

galina1969 [7]

Probability works for any given number, so we will assume there are 100 students. Of those 100, 85 of them studied. Since 75% of 85 students passed, we will multiply 85 by 0.75. This gives us 60. So of the students who studied, 60 of them passed. Of the 15 students that didn’t study, 30 percent passed. So we multiply 15 by 0.3. This gives us 4.5 students. Add up 60 and 4.5, and you get 64.5. The probability of passing is 64.5%. If you want to round up, it would be 65%. If you want to round down, it would be 64%. But the most precise answer is 64.5%.

3 0

3 years ago

35 is less than the difference of 21 and a number

My name is Ann [436]

It's 35<21-n because 35 is less that 21 and an unknown number

3 0

4 years ago

3a^2 (ab^2+b^2)=<br> How much

kiruha [24]

Answer is 3a²b (a + b)

Step-by-step explanation:

Step 1: Find 3a² (ab²+b²)

⇒ 3a² (ab²+b²) = 3a³b + 3a²b² = 3a²b (a + b)

8 0

3 years ago