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Dmitry [639]
2 years ago
13

Help please will mark Brainlyest

Mathematics
1 answer:
Juliette [100K]2 years ago
7 0

Answer:

answer is .

aldult = 3

children = 2.5

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Given a = -3, b = 5, and c = -8, then a 2 b + c is _____.<br><br> -38<br> -53<br> 37<br> 22
AnnyKZ [126]
This is how you would arrive to the answer 37

4 0
2 years ago
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A mechanical engineer wishes to compare strength properties of steel beams with similar beams made with a particular alloy. The
Annette [7]

Answer:

50

Step-by-step explanation:

Level of significance, a = 0.01

Type II error probability, b =0.05

From the z-table:

the critical value at 1% level of significance, Zα = Z0.01 = 2.33

the critical value at 5% probability, Zβ = Z0.05 = 1.645

The critical value of z can be obtained from the standard normal table using the desired level of significance and the tail of test.  

The critical value tells the number of standards deviations away is the result from the mean.

Probability of type I error denoted by  a

Probability of type II error denoted by b.

Type I error is to falsely infer the existence of something that is not there, while a type II error is to falsely infer the absence of something that is.

From the given information,

a=0.01, b=0.05, o1 = o2 =0.05, Dο = 0, D' = 0.04

The sample size is calculated as,

n = ( o^2 + o2^2) * (Za +Zb)^2 /( (D' - D0)^2)

= (0.05^2 +0.05^2)*(2.33 + 1.645)^2 / (0.04 - 0)^2

= 49.38

which is 50 [Rounded to next integer]

4 0
3 years ago
State the degree and end behavior of f(x) = 2x3 – 3x – x2 + 1. Explain or show<br> your reasoning
Olin [163]

Answer:

Answer:

As x→∞ , f(x)→-∞

As

x→-∞ , f(x)→∞

Step-by-step explanation:

End behavior is determined by the degree of the polynomial and the leading coefficient (LC).

The degree of this polynomial is the greatest exponent, or

3

.

The leading coefficient is the coefficient of the term with the greatest exponent, or

2

.

For polynomials of even degree, the "ends" of the polynomial graph point in the same direction as follows.

Even degree and positive LC:

As x→∞ , f(x)→∞ As x→∞, f(x)→∞

Even degree and negative LC:

As x→−∞ , f(x)→−∞

As

x→∞ , f(x)→−∞

6 0
3 years ago
Read 2 more answers
What is the slope of the line that passes through the points 4,5 and 12,7
Lelechka [254]
Slope: (y2-y1)/(x2-x1)
(7-5)/(12-4) = 2/8 = 1/4
The slope is 1/4
3 0
2 years ago
If you split a right angle with a ray going through the middle of the right angle, the two angles formed will be
blagie [28]

Answer:

acute angles

Step-by-step explanation:

A right angle measures 90 degrees, so if you split it into 2 parts, each part will measure less than 90 degrees. Thus, the two angles will be <u>acute</u>

6 0
1 year ago
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