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3 years ago

Please help me thanks sooo much

Mathematics

1 answer:

natima [27]3 years ago

6 0

Answer:

P = 21x + 4

Step-by-step explanation:

The perimeter is the length of all the sides added up.

(3x) + (4x + 1) + (2x - 2) + (2x - 2) + (3x + 1) + (4x + 5) + (3x + 1)

3x + 4x + 1 + 2x - 2 + 2x - 2 + 3x + 1 + 4x + 5 + 3x + 1

21x + 1 - 2 - 2 + 1 + 5 + 1

21x + 4

The equation for the perimeter is

P = 21x + 4

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Using two normal dice, what is the probability of rolling numbers that add up to 3?

Blizzard [7]

That would be rolling a 1 and a 2 .

so possibilities are 1 on first die and 2 on the second die

OR 2 on first die and 1 on the second.

Both of these have a probability of 1/6 * 1/6 = 1/36

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3 years ago

Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are

schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

$z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012$

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The nearest answer is C. 5 weeks.

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3 years ago

4x-5=19 please help thank you

frosja888 [35]

Answer:

x=6

Step-by-step explanation:

$4x - 5 = 19$

$4x = 19 + 5$

$4x = 24$

$x = \frac{24}{4}$

$x = 6$

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2 years ago

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velikii [3]

Answer:

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Step-by-step explanation:

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2 years ago

Which of the values from the set (-7, -6, -2, 0, 1, 3) satisfy the inequality-5x + 5< 25

Troyanec [42]

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Step-by-step explanation:

when you multiply -7 and -6 by -5 than add 5 you get a higher number than 25.

when you multiply -2, 0, 1 And 3 by -5 than add 5 you get a lower number than 25.

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3 years ago