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n200080 [17]
3 years ago
12

Can you also please explain, I need this done very fast

Mathematics
1 answer:
miv72 [106K]3 years ago
6 0
15) a) -3 and -4

-3(-4) = 12 (two negative numbers multiplied or divided together = positive answer)

      b) -5 and 6
6(-5) = -30 (one negative number and one positive number multiplied together = negative answer)
-5 + 6 = 1


16) 2.4 kg, 0.7 kg
c) a loss of 15kg should be your answer, because the loss has a larger number proportion than the gained


hope this helps
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Give the diagram shown at the right, find the value of 3x.<br><br><br> Pls help!!
EastWind [94]

Answer:

<h2>3x = 18</h2>

Step-by-step explanation:

Use the Pythagorean Theorem here:

30² = (3x)² + (4x)², or:

30² = 9x² + 16x²  =  25x²

Taking the square root of both sides, we get √(30)² = √(25x²), or:

30 = ± 5x

Neglect -5x, since we are measuring distances, and distances are positive.

Then 5x = 30, and so x = 6

Thus, 3x = 3(6) = 18

4 0
3 years ago
Assume that when adults with smartphones are randomly​ selected, 48​% use them in meetings or classes. If 8 adult smartphone use
Lisa [10]

Answer:

The probability is 2.2%

Step-by-step explanation:

The probability that a randomly selected adult uses the telephone in classes is always equal to 0.48.

If x represents the number of adults selected from among the 8 that the telephone uses in classes, then x is a discrete random variable that follows a binomial distribution, with:

p = 0.48

q = 0.52

n = 8

We want to find the probability of x = 5

P(x) = \frac{n!}{x!(n-x)!} *p ^ n *q ^{n-x}\\\\ P(x = 5) = \frac{8!}{5!(8-5)!} * 0.48 ^ 8 * 0.52 ^ 3\\\\ P(x = 5) = 0.02218

The probability is 2.2%

6 0
3 years ago
Write a ratio, in simplest form, that compares the two quantities (show your work): 3 years to 6 months
lutik1710 [3]

Answer:


Step-by-step explanation:

1 year has 375 days so times that by 3 its is 1125.

6 months have 187.5 days or 187 days and 12 hours.

so 1125:187.5 which is 6.

The ratio is 6:1

8 0
2 years ago
Solve the inequality 2 (m+3) +1 &gt; 23
Rasek [7]

Answer:

m>8

Step-by-step explanation:

The first step will be to distribute the 2, so that the equation becomes 2m + 6 + 1 > 23.

From here we should combine like terms, which just means adding 6 and 1, so that the equation is now 2m+7>23. Now, we just subtract 7 on both sides, which brings leave us with 2m > 16.

Lastly dividing by 2 on both sides, the answer is m>8

5 0
2 years ago
The radius of a semicircle is 9.1 centimeters. What is the semicircle's perimeter?
Sloan [31]

Answer:

<u>46.77 cm</u>

Step-by-step explanation:

Perimeter of the semicircle = Circumference + 2r

  • πr + 2r = r (π + 2)
  • 9.1 (3.14 + 2)
  • 9.1 (5.14)
  • <u>46.77 cm</u>
8 0
2 years ago
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