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yuradex [85]
2 years ago
14

Hey can you please help me

Mathematics
1 answer:
Aleks04 [339]2 years ago
4 0

Answer:

dont understand

Step-by-step explanation:

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There are 20\%20%20, percent more goblins than wizards in magic club. There are 120120120 goblins in magic club. How many wizard
Eddi Din [679]

Answer:

100

Step-by-step explanation:

We know that there are more goblins than magicians, by 20%.

Thus

be magicians M and goblins G, we have to:

G = 1 * M + 0.2 * M

G = 1.2 * M

M = G / 1.2

Therefore, knowing that in there are a total of 120 elves, replacing:

M = 120 / 1.2

M = 100

So there are 100 magicians in total in the club

5 0
3 years ago
Read 2 more answers
A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35
Maslowich

Answer:

1,539

Step-by-step explanation:

Using Simple Random Sampling in an infinite population (this is such a large population that we do not know the exact number) we have that the sample size should be the nearest integer to

\large \frac{Z^2pq}{e^2}

where

<em>Z= the z-score corresponding to the confidence level, in this case 90%, so Z=1.645 (this means that the area under the Normal N(0,1) between [-1.645,1.645] is 90%=0.9) </em>

<em>p= the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year= 35% = 0.35 </em>

<em>q = 1-p = 0.65 </em>

<em>e = the error proportion = 2% = 0.02 </em>

Making the calculations

\large \frac{Z^2pq}{e^2}=\frac{(1.645)^2*0.35*0.65}{(0.02)^2}=1,539.09

So, the sample size should be 1,539 young urban people (ages 21 to 35 years)

6 0
3 years ago
Which is equivalent to log Subscript 2 Baseline n = 4?
Marrrta [24]

Answer:

n = 16

Step-by-step explanation:

Given the expression;

log_2 n = 4

If log_a b = c, then;\\a^c = b

Applying this to the question;

2⁴⁴= n

16 = n

Swap'

n = 16

Hence the value of n is 16

7 0
2 years ago
Read 2 more answers
If the area of a rectangle is x^2+7x+12, what is the expression for the perimeter?
Cerrena [4.2K]

Length = 13 = (x + 3)

Width = 14 = (x + 4)

x2 + 7x + 12 = area of the rectangle

can be factored into

(x + 3)(x + 4)

Let L = one of the factors (x + 3)

Let W = the other factor (x + 4)

If x = 10 then

(10 + 3) = 13 = L

(10 + 4) = 14 = W

Checking this can be checked a couple of ways

Plug x = 10 into the original equation

x2 + 7x + 12

102 + 7(10) 12 = 100 + 70 + 12 = 182 = Area

Multiplty the factors

L x W = 13 x 14 = 182 = Area

I hope you find this useful if you have any questions please send me a message.

3 0
2 years ago
Can someone help me pls pls help with this question
True [87]

Answer:

D.

Step-by-step explanation:

The mean is 11,000

8 0
2 years ago
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