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IgorC [24]
2 years ago
10

can someome please explain this, I got that only 2 was correct but that's not a choice. please and thank you

Advanced Placement (AP)
1 answer:
lukranit [14]2 years ago
5 0
The answer is B) 2 and 3

When you do a Riemann's sum, you split the interval into columns. In choice 3 we are told that there are 4 equal subdivisions meaning that each of the 4 columns are 1 wide. Since it is a left Riemann's sum we add the height of the column where the LEFT side crosses the curve. For [-1, 0], the height is -1, for [0, 1] it is 0, for [1, 2] it is 2, and for [2, 3] it is 3. Now add the heights together to get 4. Then you multiply by the width, but since the columns are 1 wide, the answer is still just 4.
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Answer: 340m

Explanation:

Given that:

Streets are constructed from 10 m pieces;

A lamppost is placed at both ends and at every 10 m along its length ;

A lamppost is also placed at every notice board along its length :

Given that:

Einstein Street has 42 lamppost and 7 notice boards :

So,

7 lamppost for 7 notice boards :

Lamppost left = 42 - 7 = 35 lamppost

2 lamppost placed at both ends :

Lamppost left = 35 - 2 = 33 lamppost

Hence, the remaining is placed at 10 m along its length:

Hence, length of Einstein street :

33 lamppost each placed 10m from the starting lamppost = (33 * 10) = 330m

Distance between 33rd lamppost and the ending lamppost = 10m

Hence, total length = (330 + 10) = 340 m

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2 years ago
The graph shows the kinetic energy of both a school bus and a pickup truck as they move at various speeds. Under which of the fo
MakcuM [25]

The correct answer is B. The pickup truck is moving at 4 m/s and the school bus is moving at 2 m/s.

Explanation:

The kinetic energy is related to how fast a body moves (speed), as well as, the amount of matter in the object (mass). Due to this, even if the bus and the truck move at the same speed they do not have the same kinetic energy. Indeed, the graph shows in general the kinetic energy is higher for the school bus.

However, this does not occur if the truck moves at 4 m/s and the bus moves at 2m/s because, at this speed, the kinetic energy of the truck is 30 kilojoules, while the kinetic energy of the bus is around 15 kilojoules, which is lower. According to this, the correct answer is B.

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The bond length in an HI molecule is 1.61 Å and the measured dipole moment is 0.44 D. What is the magnitude (in units of e) of t
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Shondra was unsure about what career to go into. Her high school counselor suggested a personal assessment to point out Shondra’
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According to Shondra's personal assessment, the most suitable career cluster for her would be:

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Shondra is passionate about Justice and ensuring that people stay safe and treat each other fairly, so a career in law and safety would be relevant, as these career groups are activities that require a lot of responsibility, empathy and a sense of collectivity, for dealing with issues related to life, safety and factors that directly impact all areas of an individual's life.

A career as a physical educator would also be a good choice for Shondra, as she enjoys physical fitness and knows how to deal with high pressure situations, which are important characteristics in a physical educator, who needs to enjoy physical activities, be determined and handle with pressure to motivate and direct their clients.

Therefore it is essential that the choice of a career is based on the professional profile of an individual, there are several tests and competent institutions for the best career direction for students.

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A college professor wants to measure memory in elementary students before a vocabulary quiz. How could she operationally define
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Answer:

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There are two major types of memory:

1. Long-term memory

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The Long-term memory is the place where information have been stored for a long time. This memory is what makes you remember your name, your house address, your favorite food, your class mate's names and other information.

The short-term memory on the other hand is the type of memory that stores events or information for only a short period of time. This explains why you can be introduced to five people, but ten minutes later, you only remember one name, or no names at all!

Events or memories that are in the Short-term memory can be made to enter the long term memory with the help of some techniques.

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