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3 years ago

Evaluate each expression for the given value(s) of the variable(s)

1 answer:

4 0

In the first equation, you substitute the b for the value already given.
2 * 3 + 9
Do the operation.
6 + 9
6+ 9 = 15

You make the same with the second expression.
26 ÷ 2
26 ÷ 2 = 13

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Find the value of x for which the figure is the given special parallelogram

Aleksandr-060686 [28]

All the corners of a rectangle is equal to 90 degrees. So you need to set (x-1) and (2x+10) equal to 90 and then solve for x.

(x - 1) + (2x + 10) = 90
Combine the like terms...
3x + 9 = 90
Subtract both sides by 9...
3x + 9 - 9 = 90 - 9
3x = 81
Divide both sides by 3...
3x = 81
(3x) / 3 = 81 / 3
x = 27

6 0

3 years ago

Calculate 8 hours___ minutes

Yuliya22 [10]

Answer:

480

Step-by-step explanation:

8×60=480 minutes.

8 0

4 years ago

Alma is estimating the proportion of students in her school district who, in the past month, read at least 1 book. From a random

Maurinko [17]

Answer:

$(0.64 +1.645 \sqrt{\frac{0.64(0.36)}{50} })$

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

(0.52846 , 0.75166)

Step-by-step explanation:

Step:-1

Given that the random sample size 'n' = 50

The sample proportion

$p^{-} = \frac{32}{50} = 0.64$

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

$(p^{-} - Z_{0.90} \sqrt{\frac{p(1-p)}{n}, } , p^{-} +Z_{0.90} \sqrt{\frac{p(1-p)}{n} })$

Step(ii):-

Level of significance = 0.90

Z₀.₉₀ = 1.645

$(0.64 - 1.645 \sqrt{\frac{0.64(1-0.64)}{50}, } , 0.64 +1.645 \sqrt{\frac{0.64(1-0.64)}{50} })$

$(0.64 - 1.645 \sqrt{\frac{0.64(0.36)}{50}, } , 0.64 +1.645 \sqrt{\frac{0.64(0.36)}{50} })$

(0.64 -1.645(0.06788) , (0.64 + 1.645(0.06788)

(0.52846 , 0.75166)

Final answer:-

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

(0.52846 , 0.75166)

5 0

3 years ago

Are the following rational or irrational?

Scilla [17]

$\sqrt[3]{25}-\text{irrational}\\\\\sqrt[3]{64}=4\ because\ 4^3=64-\text{rattional}\\\\\sqrt[3]{125}=5\ because\ 5^3=125-\text{rattional}$

7 0

3 years ago

If x = - 2 and y = 3, what is the value of - x∧- y? the answer is 1/8. how?

FinnZ [79.3K]

$-x^{-y}$

You have to know that every number to negative power is the inverse, for example:

$3^{-1}=\frac{1}{3^1}$

in this exercise we will make the same thing

when $x=-2~~and~~y=3$

$-(-2)^{-3}$

let's do the inverse

$-\frac{1}{(-2)^3}$

now $(-2)^3=-8$

$-\frac{1}{-8}$

doing the signal rule

$\boxed{\boxed{\frac{1}{8}}}$

5 0

3 years ago

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