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3 years ago

Find the value of the underlined 10,698 under lined digit is 9

Mathematics

1 answer:

Kryger [21]3 years ago

3 0

I think the answer choice is in the tens place

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Solve the system using either Gaussian elimination with back-substitution or Gauss-Jordan elimination. (If there is no solution,

Gnom [1K]

Answer:

x1=-4/5, x2=18/5 and x3=7/5

Step-by-step explanation:

$\left[\begin{array}{ccc|c}1&0&-3&-5\\3&1&2&4\\2&2&1&7\end{array}\right]$

you can do linear combination between the rows:

2nd row=R2-3R1 and 3th row=R3-2R1

$\left[\begin{array}{ccc|c}1&0&-3&-5\\0&1&11&19\\0&2&7&17\end{array}\right]$

3th row=(3R2-R3)/15

$\left[\begin{array}{ccc|c}1&0&-3&-5\\0&1&11&19\\0&0&1&\frac{7}{5} \end{array}\right]$

1st row=R1+3R3 and R2-11R3

$\left[\begin{array}{ccc|c}1&0&0&-4/5 \\0&1&0&18/5 \\0&0&1&7/5\end{array}\right]$

x1=-4/5, x2=18/5 and x3=7/5

6 0

3 years ago

Mai received a $70 gift card for a coffee store. She used it in buying coffee that cost $8.48 per pound. After buying the coffee

Yuri [45]

Since she had $35.48 on her card.

Amount spent in buying coffee = $70 - $35.48 = $34.52

Cost of coffee = $8.63 per pound

No of pounds = Amount spent / cost per pound

= 34.52 / 8.63 Use your calculator.

= 4

4 0

3 years ago

Read 2 more answers

Which statements is an example of the symmetric property of congruence?

jok3333 [9.3K]

Answer:

I believe the answer is C.

Step-by-step explanation:

Example:

For any angles A and B , if ∠ A ≅ ∠ B , then ∠ B ≅ ∠ A . Order of congruence does not matter.

8 0

3 years ago

Read 2 more answers

Please help ASAP!!!!!!!!!!!

nexus9112 [7]

A is the answer because it doesn’t have a repeating x value

3 0

3 years ago

A new medical test has been designed to detect the presence of the mysterious Brainlesserian disease. Among those who have the d

astra-53 [7]

Answer:

Step-by-step explanation:

The persons who have diseases = 19%

The persons who do not have diseases = 81%

Probability for the test showing positive = Prob of actual disease and shows positive + Prob of no disease but test shows wrong

= $0.7*0.19+0.04*0.81\\=0.133+0.0324\\=0.1654$

Prob that the person actually has the disease given that the test administered to an individual is positive= $\frac{0.133}{0.1654} \\=0.0804$

30) A B C total

2x 7x x 10x

P(A) = 0.2, P(B) = 0.7, P(C) = 0.1

Let D be the event that the product is defective

P(D/A) = 0.032, P(D/B) = 0.034 and P(D/C) = 0.056

Required probability =P(C/D)

= $\frac{P(D/C) P(C)}{P(D/A) P(a)+P(D/B) P(B)+P(D/C) P(C)}$

by using Bayes theorem for conditional probability

= $\frac{0.1*0.056}{0.2*0.032+0.7*0.034+0.1*0.056} \\=\frac{0.0056}{0.0064+0.0238+0.0056} \\\\=0.156425$

32) 7 digit phone numbers with repitition including 0 will be

= $10^7$

Numbers which have atleast one 7 = total number - numbers which do not have a single 7

= $10^7 -9^7$

the probability that a 7-digit phone number contains at least one 7

= $\frac{10^7-9^7}{10^7}$

3 0

3 years ago