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AfilCa [17]
3 years ago
5

At a​ school, 129 students play at least one sport. This is 30​% of the students at the school. How many students are at the​ sc

hool?
Mathematics
1 answer:
kkurt [141]3 years ago
3 0
129/x=30/100
30x=12900
x=430
430 students
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maksim [4K]
Answer:C


Explanation:none
8 0
3 years ago
According to the empirical rule, if the data form a bell-shaped normal distribution, __________ of the observations will fall wi
Kaylis [27]

Answer:

95%

Step-by-step explanation:

The empirical rule states that if data follows normal distribution then the percentage of observations falls within one, two and three standard deviation around the mean are

i) 68% falls within one standard deviation

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iii) 99.7% falls within three standard deviation.

Hence 95% of the observations will fall within two standard deviations around the mean if the data follows normal distribution.

5 0
3 years ago
Solve1 over 25 = 5^x ^+ 4. <br> x = -7/2<br> x = −6 <br> x = 9/2 <br> x = 2
Basile [38]
The equation seems to be

   1
-------- = 5 ^ (x + 4)
  25

In that case, this is the solution, stept by step:

1) factor 25: 25 = 5^2

          1
=> ----------- = 5^(x + 4)
         5^2

2) invert 5^2

=> 5^(-2) = 5^(x+4)

3) Given that the bases are equal, the exponents also have to be equal:

=> - 2 = x + 4

3) transpose +4:

=> - 2 - 4 = x

=> x = - 6

Answer: - 6
6 0
3 years ago
William invested $800 in an account that paid 5% simple interest per year.
Blababa [14]
A) Interest = principal * rate * time

I = (800)(0.05)(3) = $120

b) $800 + $120 = $920 after the three years. $920 * (1 - 0.02) = $901.60.
3 0
3 years ago
Will mark brainliest if correct answer
Vitek1552 [10]

Answer:

The answer is 120

Step-by-step explanation:

6 0
3 years ago
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