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3 years ago

Which of these values represents the longest period of time?

2 answers:

7 0

Answer is: C, 0.09 days
900,000 milliseconds is only 15 minutes.
90 minutes is an hour and a half.
0.09 days is 2.16 hours.
And 0.9 hours is 54 minutes.

melisa1 [442]3 years ago

6 0

900,000 milisecs.

900,000/60
15,000/60
250/60
4.1 hours, the rest are smaller

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Find the number that makes the ratio equivalent to 1:4.

amid [387]

8:2 hope this helps

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3 years ago

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Even though the population standard deviation is unknown, an investigator uses z rather than the more appropriate t to test a hy

alexandr1967 [171]

Answer:

The true true level of significance of this test is more than 0.01.

Step-by-step explanation:

No standard deviation and we are told that the investigator still used z rather than the more appropriate t - distribution.

This method of using the z-distribution when standard deviation is unknown will definitely result in a smaller critical value and this in turn simply means that the p-value will be smaller than what it should really be.

Thus, it means the critical value is getting closer to the mean value than the way it should be.

Therefore, means that for a given significance of 0.01 and using the z-distribution under this no standard deviation situation, the true true level of significance of this test is more than 0.01.

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3 years ago

Which problem is molded by the equation 4x-5=45?

kolezko [41]

Answer: B.

Step-by-step explanation:

See attached. We examine the equation and decide which situation, or problem, models it correctly.

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2 years ago

A cycle race in France is 2214.5 miles in length. Miguel knows his average speed from previous races is 21.14 miles per hour. Fo

tangare [24]

Answer: 12 days

Step-by-step explanation:

Distance = speed / time

2214.50 = 21.14 / t

t = 2214.50 / 21.14 = 104.75 hours

At 9 hours per day, it will take

104.754/9 = 11.64 = 12 days

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3 years ago

Landon is standing in a hole that is 5.1 ft deep. He throws a rock, and it goes up into the air, out of the hole, and then lands

Black_prince [1.1K]

When the rock hits the ground, y = 0

-.005x^2 +0.41x -5.1 = 0

Multiply equation by (-200)

x^2 -82x +1020 = 0

Use quadratic formula:
$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} = \frac{82 \pm \sqrt{82^2 -4(1)(1020)}}{2} \\ \\ x = \frac{82 \pm 51.4198}{2} \\ \\ x = 15.29 , 66.71$

Since the ball is initially below the ground, on its way up it will reach the point where y=0 but still be in the air, therefore the ball lands the second time y=0 or when x is larger.

Answer: 66.71 feet

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3 years ago

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