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Firdavs [7]
3 years ago
7

Help me with 20,21 and 22

Mathematics
1 answer:
zubka84 [21]3 years ago
8 0
Idk about the other 2, but the answer to 20 is 270 ft

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What is the solution of square root x-4+5=2 ?<br> x = –17<br> x = 13<br> x = 53<br> no solution
professor190 [17]
What is inside the square root? Is it just the root of x? Or is it ROOT(x-4) + 5 = 2? 
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Scores on a university exam are Normally distributed with a mean of 78 and a standard deviation of 8. The professor teaching the
Triss [41]

Answer:

The percent of students who scored below 62 is 2.3%.

Step-by-step explanation:

In statistics, the 68–95–99.7 rule, also recognized as the empirical rule, is used to represent that 68.27%, 95.45% and 99.73% of the values of a Normally distributed data lie within one, two and three standard deviations of the mean, respectively.

Then,

  • P (-1 < Z < 1) ≈ 0.6827
  • P (-2 < Z < 2) ≈ 0.9545
  • P (3 < Z < 3) ≈ 0.9973

Given:

μ = 78

σ = 8

<em>X</em> = 62

Compute the distance between the value of <em>X</em> and <em>μ</em> as follows:

z=\frac{x-\mu}{\sigma}=\frac{62-78}{8}=-2

Use the relation P (-2 < Z < 2) ≈ 0.9545 to compute the value of P (Z < -2) as follows:

P(-2

The percentage is, 0.02275 × 100 = 2.275% ≈ 2.3%

Thus, the percent of students who scored below 62 is 2.3%.

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Find the total surface area of this triangular prism,<br> 30 cm<br> 18 cm<br> 7 cm<br> 24 cm
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At a lumber company, shelves are sold 4 types of wood, 3 different widths, and 6 different legths. how many different types of s
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To determine how many different types of shelves could be ordered, you will multiply all the numbers from each different aspect of the shelves to create all the possible combinations that could occur.

The reason for doing this has to do with the groupings that will occur using all three numbers.

4 x 3 x 6 = 72 

There are 72 different possibilities of shelves.
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3 years ago
The work of a student to solve a set of equations is shown:
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The student made error in step 2 because negative multiplied by positive is negative. Also negative multiplied by negative is positive
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3 years ago
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