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JulsSmile [24]
2 years ago
8

Solve the equation for all values of x by completing the square. x2 + 8.0 + 15 = 0

Mathematics
1 answer:
Aleonysh [2.5K]2 years ago
6 0

Answer:

x= -3

x= -5

Step-by-step explanation:

x^2 + 8x + 15 = 0

find which 2 numbers when multiplied equal 15 and when added equal 8

they are 3 and 5

(x+3)(x+5)

x+3 =0

x+5=0

x= -3

x= -5

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Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item pro
OleMash [197]

Answer:

P(A∣D) = 0.667

Step-by-step explanation:

We are given;

P(A) = 3P(B)

P(D|A) = 0.03

P(D|B) = 0.045

Now, we want to find P(A∣D) which is the posterior probability that a computer comes from factory A when given that it is defective.

Using Bayes' Rule and Law of Total Probability, we will get;

P(A∣D) = [P(A) * P(D|A)]/[(P(A) * P(D|A)) + (P(B) * P(D|B))]

Plugging in the relevant values, we have;

P(A∣D) = [3P(B) * 0.03]/[(3P(B) * 0.03) + (P(B) * 0.045)]

P(A∣D) = [P(B)/P(B)] [0.09]/[0.09 + 0.045]

P(B) will cancel out to give;

P(A∣D) = 0.09/0.135

P(A∣D) = 0.667

7 0
3 years ago
Pls helpppppp I really need helpppp
dem82 [27]
A and c are true ! I hope this helps
8 0
3 years ago
2x + 5y + 30 = 0 The point ( 5/2 , y) is a solution to the equation shown. What is the value of y? A) -7 B) -5 C) 0 D) 5
Zigmanuir [339]

Answer:

A) -7

Step-by-step explanation:

2x + 5y + 30 = 0

Let x = 5/2

Substitute into the equation

2(5/2) +5y +30 =0

5+5y+30=0

Combine like terms

35 +5y =0

Subtract 35 from each side

35-35 +5y = -35

5y=-35

Divide by 5

5y/5=-35/5

y = -7

6 0
3 years ago
If (NN)^3 = 8518N, what digit does N represent?
sveticcg [70]

Answer:

(C) 4

Step-by-step explanation:

I am going to solve this by trial and error:

(A) 1

Is: (11)^{3} = 85181?

(11)^3 = 1331

So 1 is not the digit of N.

(B) 2

Is: (22)^{3} = 85182?

22^3 = 10648

So 2 is not the digit of N.

(C) 4

Is: (44)^{3} = 85184?

44^3 = 85184

Correct, so the answer is c.

(D) 5

55^3 = 166375 \neq 85185

(E) 6

66^3 = 287496 \neq 85186

7 0
3 years ago
Find the measure of ∠x.<br> A) 26° <br> B) 30° <br> C) 36° <br> D) 39° <br> E) 42°
Goryan [66]

Answer:

Step-by-step explanation:

The sum of the exterior angles of any polygon is 360 degrees.  So first we need to find the measure of the exterior angle to x.

360 - 144 - 72 = 144

144 and x are supplementary, so they add up to 180.  That means that

144 + x = 180 so

x = 36

Choice C is the one you want.

8 0
3 years ago
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