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3 years ago

Are these answers right?

Mathematics

2 answers:

kozerog [31]3 years ago

8 0

Yes, but baseball should be inch. they're small

Elan Coil [88]3 years ago

7 0

No 3 should be inch 6 should be feet

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A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys

expeople1 [14]

Answer:

The probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107

Step-by-step explanation:

Consider the provided information.

It is given that mean is 440 seconds and standard deviation is 60 seconds.

z factor for less than 302 seconds would be: $z=\frac{x-\mu}{\sigma}$

z = (302 - 440) / 60 = -2.3

The probability of getting a z factor of less than -2.3 = 0.0107 approximately.

looking up in the z-table for a z factor of -2.3.

The probability of a student running the mile in less then 302 seconds would be 0.0107.

Hence, the probability that a randomly selected boy in secondary school can run the mile in less than 302 seconds is 0.0107

7 0

3 years ago

Name the values of the given digits the 4s in a 4400

IRISSAK [1]

The values of 4s that are present in 4400 are 4 thousands and 4 hundreds.
4400 = 4 thousands + 4 hundreds + 0 tens + 0 ones
so the value of first 4 is 4 thousands and second 4 is 4 hundreds.

5 0

4 years ago

One non-negative number is the reciprocal of another number. The sum of the two numbers is a minimum. What are the two numbers

Troyanec [42]

The two numbers are 1 and 1.

Let the non-negative number be x and its reciprocal be y = 1/x

The sum of the two numbers is f(x,y) = x + y

= x + 1/x

= f(x)

For f(x) to be minimum, we differentiate it with respect to x and equate it to zero to find the value of x at which irt is minimum.

So, df(x)/dx = d(x + 1/x)/dx

= dx/dx + d(1/x)/dx

= 1 - 1/x²

Equating it to zero, we have

1 - 1/x² = 0

1 = 1/x²

x² = 1

Taking square-root of both sides, we have

x = ±√1

x = ±1

Since x is non-negative x = + 1

We differentiate f(x) again to determine if this value gives a minimum for f(x).

So, d²f(x)/dx² = d(1 - 1/x²)/dx

= d1/dx - d(1/x²)/dx

= 0 - × (-2/x³)

= 2/x³

Substituting x = 1 into the equation,

d²f(x)/dx² = 2/x³

= 2/1³

= 2 > 0.

So x = 1 is a minimum point for f(x)

Since x = 1 and y = 1/x, y = 1/1 = 1

So, the two numbers are 1 and 1.

Learn more about sum of two numbers here:

brainly.com/question/13854139

5 0

3 years ago

Please help me solve and explain

Anna11 [10]

I would say go with with B

5 0

3 years ago

Read 2 more answers

I need help what do I do.?

vovikov84 [41]

Answer:

angle 17 is 90°.

Step-by-step explanation:

every angle there is a right angle and a right angle is 90°.

Have a nice day! :-)

5 0

3 years ago