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3 years ago

Which ones are the correct ones?

Mathematics

2 answers:

kirill115 [55]3 years ago

8 0

Answer:

a) 5/-6, - 5/6

b) 7/-2, -7/2

Step-by-step explanation:

schepotkina [342]3 years ago

3 0

Answer:

a) = 2nd nad 4th

b) = 3rd and 4th

When there is one negative it stays negative

Two negatives = a positive

Hope this helps

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What is the value of z? ( please help)

maxonik [38]

Answer:

z = 1

Step-by-step explanation:

See the diagram of the triangle attached to this question.

We know the property of angles of a triangle as if we sum any two interior angles then we will get the opposite exterior angle.

Hence,

42z + 37 = 40z + (26z + 13)

⇒ 42z + 37 = 66z + 13

⇒ 37 - 13 = 66z - 42z

⇒ 24 = 24z

⇒ z = 1 (Answer)

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3 years ago

How to round 5 2/9 x 9 3/5

aniked [119]

Answer:

50 2/15

Step-by-step explanation:

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3 years ago

How do i find the point-slope form and slope-intercept form for line L?

Phoenix [80]

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2 years ago

A researcher wants to study the average miles run per day for marathon runners. In testing the hypotheses: H0: μ = 25 miles vs.

masya89 [10]

Answer:

The calculated value |Z| = 1.325 < 1.881 at 0.03 level of significance

Null hypothesis is accepted

Alternative hypothesis is rejected

A researcher wants to study the average miles run per day for marathon runners is 25

Step-by-step explanation:

Step(i):-

Given sample size 'n' = 36

Given mean of the sample x⁻ = 22.8 miles

Given mean of the Population 'μ' = 25

Given standard deviation of the Population 'σ' = 10

Null hypothesis:-H₀: μ = 25

Alternative Hypothesis:H₁:μ ≠ 25

Level of significance = 3 % or 97%

The critical value Z₀.₉₇ = 1.881

Step(ii):-

Test statistic

$Z = \frac{x^{-} - mean}{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{22.8 - 25}{\frac{10}{\sqrt{36} } }$

Z = -1.325

|Z| = |-1.325| = 1.325

The calculated value |Z| = 1.325 < 1.881 at 0.03 level of significance

Null hypothesis is accepted

Alternative hypothesis is rejected

conclusion:-

A researcher wants to study the average miles run per day for marathon runners is 25

6 0

2 years ago

If two distinct positive divisors of 64 are randomly selected, what is the probability that their sum will be less than 32?

scZoUnD [109]

Answer: The required probability is $\dfrac{10}{21}$

Step-by-step explanation:

Since we have given that

Divisors of 64= 1,2,4,8,16,32,64

Sum would be less than 32

Since it has 7 divisors in total.

If we select any two distinct divisors from first five divisors, the sum will always less than 32.

So, the probability that their sum will be less than 32 is given by

$\dfrac{^5C_2}{^7C_2}\\\\=\dfrac{10}{21}$

Hence, the required probability is $\dfrac{10}{21}$

8 0

3 years ago