14. Alex writes down his car racing times for each day.
Mon – 5hr Tue – 1hr
Wed –2hr Thu – 6hr Fri – No drive.
He drives at a constant speed of 100km/h. Work out the distance he drove each day. On which day did he drive the furthest?
Answer: One positive integer is 5 more than the other. When the reciprocal of the larger number is subtracted from the reciprocal of the smaller the result is 5/14. Find the two integers.
Example: The difference between the reciprocals of two consecutive positive odd integers is 2/15. Find the integers.
Work-Rate Problems
There are two equivalent formulas to choose from when solving work-rate problems. If two people are working together on a job then their work rates add and they can perform the job working together in a shorter amount of time. If we let = the time it takes a person to complete a task then his work rate is 1/. In other words, he can complete the 1 job in number of hours. If we let = the time it takes a second person to complete the task and = the time it takes for both people working together we get the following work-rate formulas:
Example: Bill’s garden hose can fill the pool in 12 hours. His neighbor has a hose that can fill the pool in 15 hours. How long will it take to fill the pool using both hoses?
Example: Joe can complete his yard work in 3 hours by himself. If his son helps it will only take 2 hours working together. How long would the yard work take if his son was working alone?
Example: Norm and Cliff can paint the office in 5 hours working together. Being a professional painter, Norm can paint twice as fast as Cliff. How long would it take Cliff to paint the office by himself?
Work-Rate Problem: One small water hose takes twice as long to fill the basin as the larger water hose. If the two hoses working together take 40 minutes to fill the basin how long would it have taken each hose to individually fill the basin?
Work-Rate Problem: Joe can texture and paint a room in 8 hours working alone. It would take Bill 6 hours to do the same job. How long will it take them to complete the job working together?
Work-Rate Problem: Two printers, working at the same rate, work together with printing payroll checks for 4 hours before one breaks down. The other takes 3 more hours to complete the job working alone. How long would it have taken only one printer to complete the job?
Uniform Motion Problems (Distance Problems)
We have set up uniform motion problems using the formula = *. For the following motion problems, we will need the equivalent formula / = to set up the equations.
Example: The first leg of Mary’s road trip consisted of 120 miles of traffic. When the traffic cleared, she was able to drive twice as fast for 300 miles. If the total trip took 9 hours, then for how much time was she stuck in traffic?
Example: A passenger train can travel 20 miles per hour faster than a freight train. If the passenger train can cover 390 miles at the same time it takes the freight train to cover 270 miles, how fast is each train?
Example: Billy rode his skateboard 24 miles to his grandmother’s house for the day. It was a rough ride so he borrowed his grandmother’s bicycle for the return trip. Going twice as fast on the bicycle the return trip took 2 hours less time. What was his average speed on the bicycle?
Example: Brett lives on the river 45 miles upstream from town. When the current is 2 miles per hour he can row his boat downstream to town for supplies and back in 14 hours. What is his average rowing speed in still water?
Explanation:
What is the function of lysosomes?
Answer:A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria.
Explanation:
Explanation:
A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn out cell parts. They may be used to destroy invading viruses and bacteria.
Mario and several friends spend a day at the beach. While watching the ocean waves crashing to shore, Mario wonders how much of the world's water is contained in different types of bodies of water such as oceans, lakes, and rivers. He decides to research the percentage of Earth's water found in different locations. Which does his research reveal? Multiple choice question. A) Less than 3 percent of Earth's water is freshwater containing no salt. B) The ice caps located at both poles contain 30 percent of Earth's water. C) Fifty percent of Earth's water is in oceans and the glaciers at the poles. D) Ninety percent of Earth's water is in lakes, rivers, and groundwater.
Answer:
A
Explanation:
The correct answer here would be that less than 3 percent of Earth's water is freshwater containing no salt.
Generally speaking, about 71 % of the earth is made up of water. Out of this percentage, approximately 97 % is found in the oceans with less than 3 % being freshwater. About 68.7 % of the freshwater is locked-up as glacier and ice, 30.1 % is groundwater, while the remaining 1.2 % represents surface and other forms of freshwaters which include ground ice and permafrost, lakes, atmosphere, rivers, swamps and marshes, soil moisture, and the freshwater in living organisms.
The correct option is A.
Please help :)
Describe the end result of mitosis in eukaryotes
Answer:
Two genetically identical diploid daughter cells
Explanation:
Mitosis is the process of cell division through which cells proliferate to create new cells. It allows organisms to grow and replace/repair tissues.
Before the cell divides, the diploid cell (two copies of every chromosome) duplicates its genetic material. During the stages of mitosis, the genetic material is divided between two new cells such that each cell contains a complete copy of the genetic information.
Therefore, at the end of mitosis are two genetically identical daughter cells, each with a diploid genome. Each cell is also identical to the starting cell.
An organized group of interacting parts
1. Gene
2. Theory
3. Biosphere
4. Biodiversity
5. Microscope
6. Homeostasis
7. Species
8. Dependent
9.An experiment
10. Negative feedback
11. Independent
12. Biotechnology
13. Hypothesis
14. System
15. Evolution
Answer:
System
Explanation:
Definition of system
Which statement correctly describes the relationship between genes, proteins, and traits?
Dr. Simeon and her team are studying global climate change. They develop a set of mathematical equations
that relate climate data gathered over the past 100 years. Then, with the aid of a computer, they use the
equations to predict climate change in the future. The team's use of mathematical equations and computers is
an example of which science process?
A observation
B. gathering evidence
0
C. experimentation
O
D. modeling
Answer:
b gather evidence
Explanation:
ask if anymore help
An experiment was designed to investigate the effect of caffeine on the heartbeat of Daphnia magna, or water fleas. These tiny, aquatic animals are used because their transparent bodies make it easy to see their hearts and measure their heart rates. Two populations of Daphnia were raised, (A) and (B). Both populations lived in tanks of water at the same temperature and received identical amounts of food. Every 2 hours, water fleas from both populations were selected and their heartbeats were monitored. Population (A) had 0.5 g of caffeine given to them five minutes before their heartbeat was checked. Population (B) were given 0.5 g of water and with no caffeine.
Answer:
This question is incomplete. It is asking to identify the following in the experiment:
Independent variable: CAFFEINE
Dependent variable: HEARTBEAT
Experimental group: POPULATION A, which were given 0.5g of caffeine
Control group: POPULATION B, which were not given caffeine
Constants: SAME TEMPERATURE, SAME AMOUNT OF FOOD, SAME TIME BEFORE CHECKING
Explanation:
Independent variable in an experiment is the variable which is changed or manipulated by the experiment. In this experiment, the independent variable is the CAFFEINE.
Dependent variable is the variable that is measured by the experiment or in other words, the variable that responds to changes made to the independent variable. In this experiment, the dependent variable is the HEARTBEAT measured.
The experimental group of an experiment is the group that receives the experimental treatment (caffeine). In this experiment, the POPULATION A of Daphnia magna, or water fleas are the experimental group because they received 0.5g of caffeine.
On the other hand, the control group is the group that does not receive the experimental treatment. In this experiment, POPULATION B did not receive any caffeine, hence, it is the CONTROL GROUP.
Constant or controlled variable are those variables that the experimenter must keep unchanged for all groups throughout the experiment, in order not to influence the experiment's outcome. In this experiment, the constants are: SAME TEMPERATURE, SAME AMOUNT OF FOOD, SAME TIME BEFORE CHECKING (2hrs)
Question 7 Which of the following is NOT paired correctly? fat- lipid starch-nucleic acid glucose Carbohydrate enzyme protein
Answer:
Starch-nucleic acid is not paired correctly.
Within a cell, DNA is found chiefly in the
A) cell wall
B) nucleus
C) ribosomes
D) vacuoles
Answer:
Nucleus
Explanation:
We studied this last year in my school and I'm pretty sure this was the answer
Answer: B) Nucleus
Hope this helps!
what do you mean by physical quantity
Answer:
A physical quantity is a property of a material or system that can be quantified by measurement.
Please help it’s needed 15 minutes left I will do brainliest
Density involves the amount of a material in a certain volume. When a material changes phases, it changes in density in a predictable way as the amount of material stays the same but the molecules get farther apart or closer together. Water has solid and liquid states that do not follow these predictions of density in the phases of matter.
What does that mean about the densities of the phases of water?
The solid state is the most dense, followed by the liquid state, then the gas state.
The solid state is more dense than the liquid state.
The liquid state is more dense than the solid state.
The gas state is the most dense, followed by the liquid state, then the solid state.
Answer:
A
Explanation:
Unlike mitosis, meiosis results in the formation of *
A. four genetically identical sperm.
B. four genetically different body cells
C. four genetically different sex cells
D. two genetically identical body cells
Answer:
C
Explanation:
mitosis does body cells while meiosis does sex cells.
Why does the body regulate blood pH levels?
Answer:
If your blood pH levels aren't regulated then your blood will be like acid and potentially be fatal.
Explanation:
Your body tries to maintain homeostasis so regulating blood pH levels is vital.
true or false: plants release energy as ATP during cell respiration and use it for maintenance and growth
Answer: The outcome of cellular respiration is that the plant takes in glucose and oxygen, gives out carbon dioxide and water and releases energy. Plants respire at all times of the day and night because their cells need a constant energy source to stay alive.
Explanation:
One of the products of photosynthesis is missing from the.diagram.What is missing?
Answer: please insert Diagram
If the Sun was larger, do you think there would be more planets or fewer planets? Why?
Describe the difference between the retina's two photoreceptor cells.
Answer:
A cone is a visual receptor that assists individuals in processing daytime vision and color. A rod is a visual receptor that assists individuals in processing nighttime and peripheral vision.
Explanation:
. what edge said
There are two main types of photoreceptor cells of the retina -
Rod cells - Vision in poor lightCone cells - Colour vision and detailed vision in bright light.PhotoreceptorsPhotoreceptors are responsible for visual phototransduction. They convert light into biological signals.
Rod cells- contain rhodopsin that has large receptive fields and works best in dim light. They are in the outer side or peripheral area of the retina and do not distinguish color.
Cone cells - contain iodopsin, have small receptive fields and work best in high-intensity light.
Learn more about Rod cells:
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Why / how does hydrogen bonding help ice cubes float?
Answer:
First, we must understand:
What is Hydrogen Bonding?
Hydrogen Bonding is the interaction between Hydrogen atoms, with their molecules, due to the fact that their (Hydrogen atoms and bonds) are weak that even the other types of bonds are stronger.
(The other bonds are: covalent and ionic bonds)
(Hydrogen bonds are weaker than the average bonds listed above)
If you are to take how and why hydrogen bonds effect/affect ice cubes, we would have to look at how ice cube are formed. If you know, ice cubes can be created due to low temperatures (cold temperatures) making water into a solid. When ice cubes form into a sold, the spacing of the molecules become further apart, creating the density of the overall ice cube lighter than it was allowing it (ice cubes) to float.
The surfaces of the leaves of many plants help to reduce water loss because they are not water-permeable. How does the biomolecule that makes up this surface differ from other biomolecules?
It is made up of long chains of fatty acids.
It is made up of polymers of monosaccharides.
It is made up of long chains of nucleotides.
It is made up of polymers of amino acids.
Answer:
The surfaces of the leaves of many plants help to reduce water loss because they are not water-permeable. How does the biomolecule that makes up this surface differ from other biomolecules? It is made up of polymers of amino acids. It is made up of long chains of fatty acids.
Explanation:
The biomolecules that make up this surface of leaves differ from other biomolecules by the fact that they are made up of long chains of fatty acids. Thus, the correct option is A.
What are Biomolecules?Biomolecules may be defined as those types of molecules that are significantly present in the body of living organisms and are required to perform essential functions like cell division, morphogenesis, or development.
The long chains of fatty acids typically consist of a hydrophobic arrangement that prevents the movement of water from one part to the other. This specific property of forming a water barrier is only present in fatty acids.
Due to this, the surfaces of the leaves of many plants help to reduce water loss because they are not water-permeable, which means to prevent the migration of water.
Therefore, the correct option for this question is A.
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is Biology a science which deals about microorgansm exclusively
Answer:
false
Explanation:
biology is the study of every organisms
Which of the following factors would have the least effect on the carrying capacity of an ecosystem?
a.
the total number of organisms
b.
the available water supply
c.
the available food supply
d.
competitive exclusion
Answer:
D competitive exclusion
Explanation:
Answer:
D) competitive exclusion!
Explanation:
edge 2020
The formula for density is mass + volume O mass - volume O mass x volume O mass : volume
Answer:
mass : volume
Explanation:
Density is a physical quantity. An intensive property which can be used to determine any substance in nature.
Density is a unique quantity because it highlights the mass per unit volume of a substance.
Mathematically;
Density = [tex]\frac{mass}{volume}[/tex]
Mass is the amount of matter contained in any substance
Volume is the space they occupy
We clearly see that the ratio of mass to volume gives the value of density.
Which of the following two main types of cells has no nucleus? *
Answer:
eukaryotic cells and prokaryotic cells
Explanation:
Eukaryotic cells are called so because they have a true nucleus. The nucleus, which houses DNA, is contained within a membrane and separated from other cellular structures. Prokaryotic cells, however, have no true nucleus
Answer:
prokaryotic cells and eukaryotic cells
Explanation:
An observer who sees polaris straight overhead must be at the...
Earth Science question
Answer:
North Pole
Explanation:
The position of Polaris in space is almost exactly over the geographic, North Pole
if X equals to 2 and X equal to zero are zero of the polynomial 2 x cube minus 5 x square + a x + b find the value of a and b
that is what I think hope it's right good luck
Where is nitrogen often described as a limiting nutrient?
Answer:
In the open ocean, as on land, fixed nitrogen is one of the most important growth-limiting nutrients for photosynthetic organisms (primary producers) such as algae and marine bacteria.
Explanation:
What are the two inputs for aerobic cellular respiration?
a. oxygen and glucose
b. carbon dioxide and atp
c. carbon dioxide and water
d. glucose, atp and water
Oxygen and glucose are the two inputs for aerobic respiration.
What are Cellular respiration?The process of cellular respiration involves the oxidation of biological fuels in the presence of an inorganic electron acceptor, like as oxygen, to generate significant amounts of energy that are used to power the major creation of ATP.
The process of converting chemical energy from foods into adenosine triphosphate (ATP) in an organism's cells, followed by the discharge of waste products, is known as cellular respiration.
During catabolic reactions, which divide big molecules into smaller ones and release energy, respiration takes place. One of the main mechanisms through which a cell releases chemical energy to power cellular activity is respiration.
Therefore, Oxygen and glucose are the two inputs for aerobic respiration.
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I NEED HELP ON #8 ASAP PLEASEEEE!
Answer: C I'm pretty sure
Explanation: makes sense and i learned it last year ig lol
Answer:
I’m pretty sure it’s c ;)
Explanation:
Which of the following sustainable practices utilizes the MOST technology?
Answer:
hydroponic farming
Explanation: