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N76 [4]
3 years ago
10

In a class of 30 students, everyone has either a pierced nose or a pierced ear. The professor asks everyone with a pierced nose

to raise his or her hand. Eight hands go up. Then the professor asked everyone with a pierced ear to do likewise. This time there are 25 hands raised. How many students have piercings both on their ears and their noses?
Mathematics
1 answer:
e-lub [12.9K]3 years ago
4 0
There are 4 students who have piercings both on their ear and their noses.

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For a certain manufacturer only 4/5 of the item produced are not defective. If 2,000 items are manufactured in a month, how many
solmaris [256]

Answer:

1600 items should not be defective

Step-by-step explanation:

To determine the number of items that are not defective, we multiply the number of items we have by the probability that they are not defective.

Not defective items = items * probability

                                 = 2000 * 4/5

                                    1600

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3 years ago
Is it possible for a system of linear equations to have no solutions ?
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3 years ago
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3 years ago
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find the value of tan (a-b) if cos a=4/5 on the interval (270, 360) and sin b=-5/13 on the interval (270, 360)
Rudiy27

We can find a and b using inverse trig functions,

\cos(a)=\frac{4}{5}\implies a=\arccos\Big(\frac{4}{5}\Big)\approx36.87 \\\sin(b)=-\frac{5}{13}\implies b=\arcsin\Big(-\frac{5}{13}\Big)\approx-22.62

\tan(36.87-(-22.62))\approx1.7

Hope this helps.

7 0
3 years ago
Will the border line of the graph of y &lt; - x2 + 4x + 5 be a solid line or a broken
Free_Kalibri [48]

Step-by-step explanation:

When the inequality uses < or >, it is a broken line.

For the point (0, 0) it means that x = 0 and y = 0.

Since (0) < (0)² + 4(0) + 5 is true, the point is part of the solution.

7 0
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