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ankoles [38]
3 years ago
8

Please help me with this!

Mathematics
1 answer:
Verizon [17]3 years ago
6 0

Answer:

i think it has 4

Step-by-step explanation:

t + 15 is something on money

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The space shuttle travels at about 28,000 km per hour. Using that information, estimate how many hours it will take the shuttle
forsale [732]

Answer:

3928 hours

Step-by-step explanation:

6 0
3 years ago
Joe practiced his trumpet 3/4 hour on Monday and 7/12 hour on Tuesday. How long did he practice altogether
Allisa [31]
1 1/3 hours. 3/4 plus 7/12 equals 1 1/3. Hope this helps
8 0
3 years ago
A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 1200, \sigma = 60

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

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

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

4 0
3 years ago
Mary invests £12000 in a saving account.
ladessa [460]
A=Value of investment.
A=12000(1+0.015)^2
A= <span>£12362.70</span>
4 0
3 years ago
I need some help 30 points for anyone
puteri [66]

Answer:

If she wants to face the food court, she has to turn through an angle of __225°__ anti-clockwise.

3 0
3 years ago
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