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kipiarov [429]
3 years ago
14

Help with my homework. Please.

Mathematics
1 answer:
garik1379 [7]3 years ago
5 0

Answer:

Step-by-step explanation: since average speed = total distance/time

a)average speed of the journey from my home town to A = 10 miles/20 minutes = 0.5

b)journey from my home town to B = 20 miles/30 minutes = 0.7

c)10 miles + 20 miles = 30 miles

which takes 50 minutes

so: 30 miles/50 minutes = 0.6

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An absentminded scientist has just finished analyzing their data. They put two values - 25.4 and 2.54- corresponding to the stan
antoniya [11.8K]

Answer:

Standard deviation is 25.4

Step-by-step explanation:

The standard deviation is a metric that determines the variance a set of data has both above and below the mean. A standard deviation of 25.4 means that the values in a given data set are dispersed in a range of 25.4 units both above and below the mean.

The standard error refers to the Standard Error of the Mean (SEM) which measures the precision of the mean in terms of how much a sample mean is likely to differ from the population mean. By using SEM, individuals can estimate how sure they can be that the mean of the sample reflect the true mean of the population. The standard error always is lower than the standard deviation. Since, 25.4 is the higher number, this number would be the standard deviation.

4 0
3 years ago
Rectangle ABCD was dilated to create rectangle A'B'C'D. Triangle A B C D is dilated to form triangle A prime B prime C prime D.
MArishka [77]

Answer:

AB=6 Units

Step-by-step explanation:

Given the following lengths of rectangle ABCD and its dilation A'B'C'D' respectively

  • A'B' = 15 Units
  • B'C' = 9.5 Units
  • BC = 3.8 units

We are to determine the length of AB. To do this, we first determine the dilation factor.

D$ilation Factor =\dfrac{B'C'}{BC} =\dfrac{9.5}{3.8} =2.5

Therefore:

\dfrac{A'B'}{AB} =2.5\\\\\dfrac{15}{AB} =2.5\\$Cross multiply \\ 2.5 AB =15 \\AB=15 \div 2.5\\$Therefore, AB=6 Units

8 0
3 years ago
Read 2 more answers
Suppose you know that S angle and Y angle are complementary, and that angle S=5(angle Y)- 180 degrees. What is the value of angl
Bogdan [553]
The correct question is
<span>Suppose you know that S angle and Y angle are complementary, and that angle S=5(angle Y)- 180 degrees. What is the value of angle Y?

we know that
</span>S angle and Y angle are complementary
so
S+Y=90-------> S=90-Y------> equation 1
and
S=5Y-180----> equation 2

equate equation 1 and equation 2
90-Y=5Y-180------> 5Y+Y=180+90-----> 6Y=270-----> Y=45°
S=5*45-180-----> S=45°

the answer is
Y=45°
8 0
3 years ago
Mary has to choose between a job and learning French during summer
Andrei [34K]

Answer:

To develop a molecular clock, you need to find which of the following?

a sequence of molecules

the rate at which changes occur in a type of molecule

how much total change has occurred in a type of molecule from two different species

how many molecules a species has

Step-by-step explanation:

To develop a molecular clock, you need to find which of the following?

a sequence of molecules

the rate at which changes occur in a type of molecule

how much total change has occurred in a type of molecule from two different species

how many molecules a species has

4 0
3 years ago
Read 2 more answers
Can someone help with this question, answer asap. I’ll give brainliest to the first best answer. Thanks.
postnew [5]

Answer:

2/3 on technique

1/9 on fitness exercise

2/9 on strength exercise


Step-by-step explanation:

He spends 2/ (2 + 1) = 2/3 of his time on technique

That leaves him with 1/3 of his time exercising

Time spent on fitness = 1 (1+2)  * 1/3

= 1/3 * 1/3 = 1/9 of his time

Time spent on strength exercise = 2/3 * 1/3  = 2/9

8 0
3 years ago
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