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3 years ago

Which expression is equivalent to 10 - 8

Mathematics

1 answer:

FromTheMoon [43]3 years ago

5 0

Answer:

Step-by-step explanation:

10-8=2

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What is 8 21/40 converted to a decimal

mrs_skeptik [129]

It would be 8.525
The 8 is 8
Divide 21 by 40

3 0

3 years ago

Find the sum of 10x^2-10x-6 and x+6.

Andre45 [30]

Answer:

10x²−9x

Step-by-step explanation:

10x²−10x−6+x+6

=10x²−10x−6+x+6

Combine Like Terms:

=10x²−10x−6+x+6

=(10x²)+(−10x+x)+(−6+6)

=10x²−9x

Hope this helps!

3 0

3 years ago

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

A painter can paint 3 walls in one hour. Which graph models a relationship with the same unit rate?

Irina18 [472]

Answer:

the bottom faded looking one

Step-by-step explanation:

5 0

3 years ago

The volumes of two solids are 135 in3 and 625 in3. Find the similarity ratio.

ludmilkaskok [199]

Formula for ration:

$\dfrac{Volume_1}{Volume_2} = \bigg( \dfrac{Length_1}{Length_2} \bigg)^3$

$\text {Ratio = } \sqrt[3]{\dfrac{135}{625} } = \sqrt[3]{\dfrac{27}{125} } = \dfrac{3}{5}$

Answer: Ratio = 3 : 5

4 0

4 years ago