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Bess [88]
4 years ago
4

Josefina started to solve for x in the equation

Mathematics
2 answers:
balandron [24]4 years ago
5 0

\text{Josefina started to solve for x in the equation}\\

3.5 = 1.9-0.8|2x- 0.6|

\text{using the steps below:}

3.5 = 1.9-0.8|2x-0.6|

1.6 = -0.8|2x-0.6|

-2 = |2x-0.6|

\text{Josefina stop at Step 3 because on the right side we have mod. }\\ \text{and this mod returns only positive values}\\ \\

\text{But on the left hand side , we have negative value.}\\ \text{Hence False, it mean no solution exists}\\

Mekhanik [1.2K]4 years ago
4 0

Answer: Absolute values cannot be equal to negative values.

There were no viable solutions.

Absolute values represent distances from values, which cannot be negative.

Step-by-step explanation: just did it

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The life in hours of a biomedical device under development in the laboratory is known to be approximately normally distributed.
bearhunter [10]

Answer:

Kindly check explanation

Step-by-step explanation:

H0 : μ = 5500

H1 : μ > 5500

The test statistic assume normal distribution :

Test statistic :

(Xbar - μ) ÷ s/sqrt(n)

(5625.1 - 5500) ÷ 226.1/sqrt(15) = 2.1429 = 2.143

Pvalue from test statistic :

The Pvalue obtained using the calculator at df = 15 - 1 = 14 is 0.025083

α = 0.05

Since ;

Pvalue < α

0.025083 < 0.05 ; Reject H0

The confidence interval :

Xbar ± Tcritical * s/sqrt(n)

Tcritical at 95% = 1.761 ;

margin of error = 1.761 * 226.1/sqrt(15) = 102.805

Lower boundary : (5625.1 - 102.805) = 5522.295

(5522.295 ; ∞)

The hypothesized mean does not occur within the constructed confidence boundary. HENCE, there is significant eveidbce to support the claim that the true mean life of a biomedical device is greater than 5500

4 0
3 years ago
Evaluate the expression for the given variable.<br>​
Reika [66]

Answer:

8

Step-by-step explanation:

Substitute x = 3 into the expression

= \frac{(9-3)^2+4}{5}

= \frac{6^2+4}{5}

= \frac{36+4}{5}

= \frac{40}{5}

= 8

7 0
3 years ago
Help with this please
torisob [31]

Answer:

7. f(4)=5⁴

f(4)=625

8. h(-3)=3•4^(-3)

h{-3)=3/4³

H(-3)=3/64

9. y=8•0.7³

y=8•0.343

y=2.744

Hope it helps

6 0
3 years ago
How to write 3,897.003 in expanded form
alexdok [17]
3,000 + 800 + 90 + 7 + .003 = 3,897.003
Hope this helps!!!:)
8 0
3 years ago
What is the solution for the equation 2x - 3 = - 8
almond37 [142]

2x - 3 = -8

    +3     + 3

2x = -5

/2    /2

x = -2.5 (Answer)

Prove.

2(-2.5) - 3 = -8

-5 - 3 = -8

-8 = -8

True.

6 0
3 years ago
Read 2 more answers
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