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3 years ago

The quotient 97.3hr ÷ 5.5hr contains how many significant digits?A. 4B. 3C. 2D. 1

Mathematics

1 answer:

aleksandrvk [35]3 years ago

5 0

The answer is.. C I hade trouble with this question and I finally got it

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What are the zeros of the quadratic function? f(x)=3x^2−3x−18 i need the answer asap

dusya [7]

Answer:

The zeroes are 3 and -2...if u need explanation I am open but seem in a hurry

6 0

2 years ago

8.52 The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches

sweet [91]

Answer:

Heights of 29.5 and below could be a problem.

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches.

This means that $\mu = 32, \sigma = 1.5$

There may be a problem when a child is in the top or bottom 5% of heights. Determine the heights of 2-year-old children that could be a problem.

Heights at the 5th percentile and below. The 5th percentile is X when Z has a p-value of 0.05, so X when Z = -1.645. Thus

$Z = \frac{X - \mu}{\sigma}$

$-1.645 = \frac{X - 32}{1.5}$

$X - 32 = -1.645*1.5$

$X = 29.5$

Heights of 29.5 and below could be a problem.

4 0

2 years ago

Denise has 6 hours to spend training for an upcoming race. She completes her training by running full speed the distance of the

VMariaS [17]

To solve this problem,you need to use the formula d = rd (distance = rates x time)She runs at a speed of 7 mph and walks at a speed of 3 mph. Her distance running is d = 7trwhere tr is the time she spends running Her distance walking isd = 3twwhere tw is the time she spends walking The distances are the same so7tr = 3tw We also know that the total time is 4 hourstr + tw = 4tr = 4-tw Substitute this value of tr in the first equation7tr = 3tw7(4-tw) = 3tw28-7tw = 3tw28 = 10tw2.8 = tw Denise will spend 2.8 hours (2 hours, 48 minutes) walking back and 1.2 hours (1 hour, 12 minutes running.

Hope I helped :)

5 0

2 years ago

Y + 6.2x = −13, when x = −4

alexgriva [62]

You would multiply 6.2 by -4 which is -24.8 so then the equation is y+-24.8=-13 then add -24.8 to both sides and it will be y=11.8

4 0

3 years ago

Can someone pls pls pls pls pls pls answer these question

Lisa [10]

Answer:

Decay

Step-by-step explanation:

6 0

2 years ago

The quotient 97.3hr ÷ 5.5hr contains how many significant digits?A. 4B. 3C. 2D. 1​

The quotient 97.3hr ÷ 5.5hr contains how many significant digits?A. 4B. 3C. 2D. 1