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Rina8888 [55]
3 years ago
8

Find the sum and express it in simplest form. (3a^2 + 2a) + (5a^-a -7) ​

Mathematics
1 answer:
fredd [130]3 years ago
7 0

Answer:

8a^2+a-7

Step-by-step explanation:

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Chapter 7, Section 7.2, Question P9 The process for manufacturing a ball bearing results in weights that have an approximately n
bogdanovich [222]

a. Let X be a random variable representing the weight of a ball bearing selected at random. We're told that X\sim\mathcal N(0.15,0.005^2), so

\mathrm P(X

where Z\sim\mathcal N(0,1). This probability is approximately

\mathrm P(Z

b. Let X_i be a random variable representing the weight of the i-th ball that is selected, and let Y be the mean of these 4 weights,

Y=\dfrac{X_1+X_2+X_3+X_4}4

The sum of normally distributed random variables is a random variable that also follows a normal distribution,

X_1+X_2+X_3+X_4\sim\mathcal N(4\cdot0.15,4\cdot0.005^2)

so that

Y\sim\mathcal N(0.15,0.005^2)

Then

\mathrm P(Y

c. Same as (b).

8 0
3 years ago
What is the degree of this polynomial below ?<br> 2x^5 + 4x^3 -3x^8
xeze [42]

Answer:

8

Step-by-step explanation:

the degree is the highest exponent value

8 0
3 years ago
URGENT!!!!!!! HELP PLEASE!!!!!!
IRISSAK [1]

Answer:

x^\frac{2}{3}

Step-by-step explanation:

Using the power of power rule (multiply the exponents)

x^\frac{4}{3} × ^\frac{1}{3}       x^\frac{2}{3} × ^\frac{1}{3}

x^\frac{4}{9}            x^\frac{2}{9}

When exponents are multiplied, add the answers:

x ^ ( 4/9 + 2/9 )

x ^ ( 6/9 )

x ^ ( 2/3 )

6 0
3 years ago
The following data is from a simple random sample of 12 students GPAs. 3.12 2.45 4.0 3.76 3.54 2.78 3.39 3.21 1.98 3.43 3.98 2.7
Rufina [12.5K]

Answer: 3. 2

Step-by-step explanation:

Given the data:

3.12 2.45 4.0 3.76 3.54 2.78 3.39 3.21 1.98 3.43 3.98 2.77

Point estimate of population mean :

Σx / N

(3.12 + 2.45 + 4.0 + 3.76+ 3.54 + 2.78 + 3.39 + 3.21 + 1.98 + 3.43 + 3.98 + 2.77)

= 38.41 / 12

= 3.2008

4 0
3 years ago
Which of the following numbers is not an integer? A -32 B 80 C 5.81 D 0 O<br>​
larisa [96]

5.81

option C

hope it helps...!!!

3 0
2 years ago
Read 2 more answers
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