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3 years ago

Simplify 2x+y-3^3+1/2=

Mathematics

1 answer:

tatiyna3 years ago

7 0

The answer is 2x + y - 53/2

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Multiply the polynomials.

Oxana [17]

I’m pretty sure that the answer is D

3 0

3 years ago

39 less than twice a number is 5 times the sum of a number and two times the number. Find the number

umka2103 [35]

$2n - 39 = 5(n + 2n)\\2n - 39 = 5(3n)\\2n - 39 = 15n\\2n = 15n + 39\\-13n = 39\\\\n = -3$

3 0

3 years ago

148=3x+3+4x+1 solve

Andreas93 [3]

Answer: 20.57142857

Step-by-step explanation:

148 = 3x + 3 + 4x + 1

Step one: combine like terms

148 = 7x + 4

Step 2: Subtract the 4 over to 148

144 = 7x

Step 3: Divide 7 on both sides

20.57142857 = x

6 0

3 years ago

In a random sample of 8 people, the mean commute time to work was 33.5 minutes and the standard deviation was 7.2 minutes. A 95

Elina [12.6K]

Answer: Margin of error = 6.58

Confidence interval = (26.91, 40.08)

Step-by-step explanation:

Since we have given that

Sample size n = 8

Sample mean = 33.5 minutes

Population standard deviation = 9.5 minutes

At 95% confidence interval,

α = 0.05

t = 1.96

So, Margin of error is given by

$t\times \dfrac{\sigma}{\sqrt{n}}\\\\=1.96\times \dfrac{9.5}{\sqrt{8}}\\\\=6.58$

Confidence interval would be

Lower limit:

$\bar{x}-6.58\\\\=33.5-6.58\\\\=26.91$

Upper limit:

$\bar{x}+6.58\\\\=33.5+6.58\\\\=40.08$

Hence, the interval would be (26.91, 40.08)

But at standard deviation 7.2 minutes, the confidence interval was (27.5, 39.5)

Confidence interval using the standard normal distribution is wider than the confidence interval using t distribution.

3 0

3 years ago

What is 7/6y-8=2<br> A 5 5/9<br> B -10 4/5<br> C 18<br> D 20

koban [17]

Answer: The answer is actually 8 4/7

Step-by-step explanation:

Because...

7/6y-8=2

Add the 8 to the other side

7/6y=10

You then have you divide 7/6y by 7/6, then do it to the other side giving you 60/7.

That gives you a mixed number of 8 4/7.

4 0

3 years ago