9=-7x+7x^2 Helppp please

Mathematics

1 answer:

8_murik_8 [283]2 years ago

8 0

Answer:

x= 0.21428571428 or x=0.2

Step-by-step explanation:

-7x+7x^2=9 1. simplify 7x^2

-7x+ 7x(7x)=9 2. combine like terms

-7x+49x=9 3. combine like terms

42x=9 4. /42 on both sides

x= 0.21428571428 or x=0.2

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g Suppose a factory production line uses 3 machines, A, B, and C for making bolts. The total output from the line is distributed

Vladimir [108]

Answer:

The probability that it came from A, given that is defective is 0.362.

Step-by-step explanation:

Define the events:

A: The element comes from A.

B: The element comes from B.

C: The element comes from C.

D: The elemens is defective.

We are given that P(A) = 0.25, P(B) = 0.35, P(C) = 0.4. Recall that since the element comes from only one of the machines, if an element is defective, it comes either from A, B or C. Using the probability axioms, we can calculate that

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Recall that given events E,F the conditional probability of E given F is defined as

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$P(D) = P(A)P(D|A)+P(B) P(D|B) + P(C)P(D|C) = 0.05\cdot 0.25+0.04\cdot 0.35+0.02\cdot 0.4 = 0.0345$