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geniusboy [140]
2 years ago
13

LOOK AT PICTURE look at picture

Mathematics
1 answer:
MAVERICK [17]2 years ago
4 0

Answer:

-25.776

Step-by-step explanation:

-7.2

x 3.58

Multiply to get the sums and add them together to get your answer.

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Roberto rowed 20 miles downstream in 2.5 hours. The trip back, however, took him 5 hours. Find the rate that Roberto rows in sti
almond37 [142]

Answer:

<em>Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour</em>

Step-by-step explanation:

<u>Relative Speed</u>

When a body is moving at a constant speed v, the distance traveled in a time t is:

d=v.t

When Roberto rows downstream, his speed in still water is added to the speed of the water, making it easier to travel the required distance.

When Roberto rows upstream, his speed in still water is affected by the speed of the water, both are subtracted and the required distance is covered in more time.

Let's call

x = Roberto's rowing speed in still water

y = Speed of the river current

The speed when rowing downstream is x+y, thus the distance traveled is

d=(x+y).t_1

Where t1=2.5 hours. Substituting values:

20=(x+y)*2.5

Rearranging, we find the downstream equation:

2.5x+2.5y=20\qquad[1]

The speed when rowing upstream is x-y, and the distance traveled is

d=(x-y).t_2

Where t2=5 hours. Substituting values:

20=(x-y)*5

Rearranging, we find the upstream equation:

5x-5y=20\qquad[2]

Multiplying [1] by 2:

5x+5y=40

Adding this equation to [2]:

10x=60

Solving:

x=60/10=6

Dividing [2] by 5:

x-y=4

Solving for y

y=x-4=6-4=2

Thus, Roberto's speed in still water is 6 miles/hour and the river speed is 2 miles/hour

3 0
3 years ago
the sum of two numbers is 75. The second number is three less than twice the first. what is the larger number?
KatRina [158]

Answer:

49

Step-by-step explanation:

If the smaller number is

x

, then the larger number is

2

x

−

3

Explanation:

(

x

)

+

(

2

x

−

3

)

=

75

3

x

−

3

=

75

3

x

=

78

x

=

26

The numbers are 26 and 49.

5 0
3 years ago
.question 9a data analyst is using statistical measures to get a better understanding of their data. what function can they use
MakcuM [25]

Planning, designing, gathering data, analyzing, creating relevant interpretations, and publishing the research findings are all statistical approaches that go into conducting a study.

The statistical analysis lends meaning to the abstract numbers, giving the data some life. Only when appropriate statistical tests are applied will the results and inferences be accurate. Science's field of statistics deals with gathering, organizing, analyzing, and extrapolating data from samples to the entire population. This necessitates the use of an acceptable statistical test, an adequate study design, and an appropriate study sample selection.  However, if we want additional information about these, a consulting company may be able to assist us. we will benefit more from Silver Lake Consulting for our project.

Learn more about Statistical here-

brainly.com/question/23091366

#SPJ4

6 0
1 year ago
The maximum capacity of the school auditorium is 420 people. Write an inequality for the situation. Tell what type of numbers th
posledela
The number of people in the auditorium can be less than or equal to 420 so let p represent the number of people
The inequality is p≤420
4 0
3 years ago
What is Perpendicular Slice? is up or down or Left to Right I Forgot
Nikolay [14]

Answer:

up and down

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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