Homework answers and tutorials

Waiting for answer How do I find the directrix of a hyperbola?
The directrix is the line ##x=(a^2)/c##. For a hyperbola ##(xh)^2/a^2(yk)^2/b^2=1##, where ##a^2+b^2=c^2##, the directrix is the line ##x=a^2/c##.
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Waiting for answer How do you calculate concentration of ions in a solution?
The of depends on the between the dissolved substance and the cations and anions it forms in solution. So, if you have a compound that dissociates into cations and anions, the minimum concentration of each of those two products will be equal to the concentration of the original compound. Here's...
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Waiting for answer Difference between magma and lava
Magma is melted rock stored in the Earth's crust, while lava is magma that reaches the surface in volcanoes or other vents. Magma is a generic term for molten rock found beneath the...
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Waiting for answer The average height of five men is 68 inches. If one man is 7...
The right answer is (b) ##69## Let the height of five men be ##H_1##, ##H_2##, ##H_3##, ##H_4## and ##H_5##. We know that (1) ##(H_1+H_2+H_3+H_4+H_5)/5 = 68## (2) ##H_1 = 70## (3...
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Waiting for answer Given that Ka for HBrO is 2.8 × 109 at 25 °C, what is the v...
For a weak acid, you can determine the value of the base dissociation constant, ##K_b##, of its by using the water dissociation constant, ##K_W##. Mathematically, the relationship that exists between ##K_a##, ##K_b##, and ##K_W## can be written like this ##K_W = K_a * K_b = 10^(14)## In the c...
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Waiting for answer How would you define density?
##"Mass per unit volume"## ##"Density, "rho## ##=## ##"Mass"/"Volume"## We could apply the term to all . For chemists, the most typical units of are ##g*mL^1##.
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Waiting for answer A substance Q conducts electricity both when solidand molten...
a metal or a metalloid A metal conducts electricity. A metalloid could conduct electricity ;but if it does, its conducting power is not as strong as that of a metal.
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Waiting for answer What is the function of the integumentary system?
The is that organ system that protects the body from various kinds of damage like dehydration and abrasions from outside. The skin acts as the body's first line of defence against i...
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Waiting for answer What are the three psychosexual stages?
oral stage, anal stage, phallic stage, latency stage, and genital stage. According to Sigmund Freud humans have five stages of development in which they develop sexually. He termed t...
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Waiting for answer What is the isomer, monomer, and polymer for carbohydrates?
A monomer is a single unit of a substance (eg. Amino acid).A polymer is a chain of monomers (eg protein).An isomer is a molecule of an element with the same chemical formula but a different chemical structure (sucrose and maltose).
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Waiting for answer How does Newton's third law work when you walk?
When you walk your foot pushes on the floor and the floor pushes back on you  in the opposite direction, resulting in your moving in the direction you are walking. Newton's 3rd law...
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Waiting for answer Because gravity on is about onethird of that on Earth, coul...
No, we can't infer from the lower value of due to gravity of Mars that it has more mass than Earth. The force of gravity is explained . Taking extract from the linked answer. The...
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Waiting for answer What is a binary acid and how do you name them?
A binary acid is an acid containing two , the hydrogen atom and a more electronegative element. Its name is prefixed with hydro and ends with the second element's name suffixed with "ic"....
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Waiting for answer How is the confidence interval formula for the slope similar...
it has the same format. eg. 95% CI for ##B_1## = ##b_1## ##+_## SE(##b_1##)
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Waiting for answer How do you simplify ##sqrt(44)##?
The answer is ##2sqrt(11)##. To simplify a square root, you factor what's inside the root into perfect squares and everything else. In this case, you can factor 44 into a product of 4 and 11: ##sqrt(44) = sqrt(4*11)## 4 is a perfect square, so you can take it out its root giving you the answer:...
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Waiting for answer How do you verify ##(sin^2x  cos^2x)/(sinx + cosx)=sinxcos...
Very Carefully... The top portion of this fraction is a difference of 2 squares, meaning ##sin^2(x)cos^2(x)=(sin(x)+cos(x))(sin(x)cos(x))##, so ##(sin^2(x)cos^2(x))/(sin(x)+co...
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Waiting for answer What is the molecular weight of H2SO4?
98 In order to calculate the molecular weight f H2SO4 you need to add up all the atomic masses of individual elements. Atomic mass of oxygen=16 * 4=64 Atomic mass of hydrogen= 1 *...
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Waiting for answer What is the past and past participle of the word "show"?
show  showed  shown. It is an irregular verb. simple form : showed Past participle form: shown
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Waiting for answer What happened as a result of the Opium War?
China was opened to Europeans for the first time...ever, basically. Britain, after subduing much of India, had a lot of resources they could extract from the subcontinent. One of th...
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Waiting for answer What is 66% as a fraction in simplest form?
##33/50## per cent means ##color(blue)"out of one hundred"## ##rArr66%=66/100## Simplify the fraction by dividing numerator/denominator by a ##color(blue)"common factor."## When n...
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