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3 years ago

Simplify: -3/8+ (-1/4)

Mathematics

1 answer:

Salsk061 [2.6K]3 years ago

6 0

Answer:

Exact form: - 1/8

Decimal form: -0.125

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Area of composite shapes!!

Bingel [31]

Answer:

34.5 units²

Step-by-step explanation:

7 x 3 = 21

4.5 x 3 = 13.5

21 = 13.5 = 34.5 units²

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2 years ago

Read the numbers and decide what the next number should be. 20 30 40 50 60 70

goldenfox [79]

80 Because the numbers are going up by 10

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3 years ago

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Suppose x + y = 13 and the value of x increases by 4. If their sim remain the same, what must happen to the value of y?

Oksi-84 [34.3K]

The value of y would decrease if x increases and the sum stays the same.

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3 years ago

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Increasing numbers of businesses are offering child-care benefits for their workers. However, one union claims that fewer than 8

Y_Kistochka [10]

Answer: c. -2.15

Step-by-step explanation:

As per given we have:

Null hypothesis : $H_{a}: p\geq0.80$

Alternative hypothesis : $H_{a}: p$

let p be the proportion of firms in the manufacturing sector offer child-care benefits

A random sample of 390 manufacturing firms is selected and 295 of them offered child-care benefits.

sample size : n= 390

sample proportion : $\hat{p}=\dfrac{295}{390}=0.7564$

Test statistic for proportion :

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

Substitute the values , we get

$z=\dfrac{0.7564-0.80}{\sqrt{\dfrac{0.80(1-0.80)}{ 390}}}$

$z=\dfrac{-0.0436}{\sqrt{0.000410256410256}}$

$z=-2.15257752474\approx-2.15$

Hence, the value of test statistic = -2.15

Correct option is c. -2.15 .

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3 years ago

Identify the function that is exponential.

den301095 [7]

Please, for clarity, indicate exponentiation using the " ^ " symbol.

y = - 3x^5 ("Negative three times the 5th power of x")

y = 3x^8

y - -3(0.5)^x

y = -2^4

An exponential function has an exponent which is variable, where the base stays constant; the base cannot be a negative number or a zero. The third answer choice is the correct one, as we raise the constant 0.5 to the power x:

y = -3(0.5)^x

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3 years ago