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3 years ago

14

A bag contains purple marbles and blue marbles, 84 in total. The number of purple marbles is 9 more than 4 times the number of b

lue marbles. How many purple marbles are there?

2 answers:

Flura [38]3 years ago

5 0

Answer: there are 32 purple marbles in the bag

Step-by-step explanation:

did the test

Romashka [77]3 years ago

4 0

There are 32 purple marbles in the bag.

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Solve for x and y in the system of equation<br>3x²+4y=17 <br>2x²+5y=2<br>I'll mark brainliest

Novay_Z [31]

Answer:

$x=\pm \sqrt{11} \\y=-4.$

Step-by-step explanation:

$\left \{ {{3x^2+4y=17} \atop {2x^2+5y=2}} \right. \\\\Then\\\\\left \{ {{2 \times (3x^2+4y)=2 \times 17} \atop {3\times(2x^2+5y)=3\times2}} \right. \\\\\left \{ {{6x^2+8y=34 \quad (1)} \atop {6x^2+15y=6\quad (2)}} \right.\\\\(1)-(2) \Rightarrow -7y=28 \Rightarrow y =-4.\\Since \: \: 2x^2+5y=2 \Rightarrow 2x^2=2-5y\\\Rightarrow 2x^2=2+20=22\\\Rightarrow x^2=22:2=11\\\Rightarrow x=\pm \sqrt{11}.$

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3 years ago

What is the measure of 162<br> A. 324°<br> B. 162°<br> O C. 81°<br> D. 72°

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3 years ago

The graph of a quadratic function intercepts the x-axis in the two places and the y-axis in one place.

wolverine [178]

Correct Answer:
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4 years ago

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A manufacturing company produces parts that are good (90%), partially defective (2%), or completely defective (8%). These parts

Schach [20]

Answer:

The probability that a part is good given that it passed the inspection machine is P=0.978.

Step-by-step explanation:

As the inspection machine detect and discard any part that is completely defective, only the good and partially defective parts passed this inspection.

Then, if we have:

Probability of being a good part P(G)=0.90

Probability of being a patially defective part P(P)=0.02

Probability of being a completely defective part P(D)=0.08.

Probability of passing the inspection machine = 1-P(D)=1-0.08=0.92

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$P(G|Pass)=P(G)/P(Pass)=0.90/0.92=0.978$

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