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Shane

Questions (271)

In the expansion of (1-2x)^11 the coefficient of x^3 is k times the coefficient of x^2. Evaluate k.
1. 1 answer
2. 540 views
Expand (1-6x)^4 (1+2x)^7 in ascending powers of x up to and includeing the terms in x^3.
1. 1 answer
2. 761 views
Expand (1+2x)^20 - (1-2x)^20) in ascending powers of x up to the term in x^5 and use this result to evaluate (1.02)^20 -
1. 2 answers
2. 590 views
Obtain the binomial expansion of (2-x) (1+1/2x)^8 in ascending powers of x as far as the term in x^3. Use your result to
1. 1 answer
2. 1,328 views
Pls help me to show that (1+root x)^5= 10 root x + 20x root x + 2x^2 ]oot x.
1. 1 answer
2. 389 views
1. In the following reactions, identify which reactants are the oxidizing agent and which are the reducing agents.a. 2S2O32-
1. 1 answer
2. 741 views
A solution container was only label 0.005M. When phenolphthalene was added onto the solution, the color of the solution turned
1. 1 answer
2. 537 views
Determine the [H+] when [OH-] is 2.0 times 10^-2 mole.dm-3.
1. 1 answer
2. 762 views
ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC = 32 cm and AP = 8 cm,
1. 0 answers
2. 1,209 views
A surveyor measures the angle of elevation of the top of the mountain from a point (P) at sea level as 30 detre along a track
1. 0 answers
2. 848 views
Calculate the [H], [OH], pH and the pOH of this solution; 0.0025 M NaOH
1. 1 answer
2. 1,079 views
The position vector of the point A(3,4) relative to an origin O is a. (a) Express vector a or (OA) in terms of i and j. (b) Find
1. 1 answer
2. 957 views
ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC=32cm and AP = 8 cm,
1. 1 answer
2. 1,126 views
Find two geometric progressions having: 54 as third term and 27/32 as ninth term.
1. 2 answers
2. 987 views
Find the total amount required to pay off a loan of 16000 plus interest at the end of 8 years if the interest is compounded
1. 1 answer
2. 570 views
The third term of a sequence is 2(2/3) and the sixth term is 9. Find the first six terms when the sequence is; (a) arithmetic
1. 1 answer
2. 794 views
Given the f (x) =2x^3 + ax^2 + bx - 9. (a)Find the value of a and b if f (x) has a factor x -3 but leaves a reminder of 8 when
1. 0 answers
2. 392 views
If the nth term of a sequence is 3 x 2^n-1, Write down the first three terms.
1. 1 answer
2. 563 views
Find two geometric progression having: 2 as second term and 1458 as eight term,
1. 1 answer
2. 836 views
One step of the Ostwald process for manufacturing nitric acid involves making nitrogen monoxide by oxidizing ammonia in the
1. 1 answer
2. 1,072 views
When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times
1. 1 answer
2. 499 views
When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times
1. 0 answers
2. 435 views
Write the expression in terms of sine only.8(sin 2x − cos 2x)
1. 1 answer
2. 2,850 views
I have no more than five books in my bag.I need to write an inequality for this, x<5 ?
1. 9 answers
2. 2,005 views
solve this equation. log (2x + 1) base 2 = -3
1. 1 answer
2. 278 views
Solve this logarithmic equation. 3 log 2 base x + log 18 base x = 2
1. 0 answers
2. 427 views
Solve this logarithmic equation. 3 log 2 base x + log 18 base x = 2
1. 0 answers
2. 437 views
Solve this equation. 3^2x - 3^x+2 = 3^x - 9
1. 0 answers
2. 306 views
Proof this identities. (a) sin x cot x = cos x
1. 1 answer
2. 378 views
Please I need help.Show full working out. (a) sin x cot x= cos x (b) (1 + tan theta)^2 + (1- tan theta)^2 = 2sec^2theta
1. 1 answer
2. 1,115 views
Please help me simplify this and show full working out. (a) (2x^3 divide 3y^4)^2 multiply (x divide 3y)^-2 (b) a-a^-1 divide a^2
1. 1 answer
2. 672 views
Ship A is 18.5km from a port P on a beearing of 045 degree and ship B is 26.4km from point P on a bearing of 105 degree.
1. 1 answer
2. 684 views
Please help me.Iam stuck. Find all the possible values of theta between 0 degree and 360 degree for the following quadratic
1. 1 answer
2. 529 views
Please help me.Iam stuck. Find all the possible values of theta between 0 degree and 360 degree for the following quadratic
1. 0 answers
2. 485 views
AB is a 12 metre flagpole on top of a building. Given angle QPB=56 degree 37' and angle QPA=43 degree 19',find the distance of
1. 1 answer
2. 473 views
A and B are two balloons at the same height and 1000 metre apart. O is a ground observation position. Angle AOX is 45 degree 15'
1. 1 answer
2. 475 views
Find the area of the triangle with sides 8.6 cm, 9.1cm and 9.7cm. First find the size of one of the angles.
1. 1 answer
2. 404 views
An aircraft which is maintaining a constant altitude of 1000 metre is travelling directly away from an observer. At a particular
1. 0 answers
2. 480 views
Please I need help.Iam stuck with this question.Using sine and cosine rule: A rocket launced vertically from L is observed from
1. 1 answer
2. 1,034 views
Please help me. P and Q are two gun placements 1250m apart. T is a target. The angles TPQ and TQP are 73 degree 24' and 68
1. 2 answers
2. 377 views
Iam stuck.Please anyone help me. P and Q are two trees 490m apart beside a river. F is a flagpole on the other side of the
1. 1 answer
2. 485 views
A tower T is observed from two points A and B which are 240 metres apart. The angle TAB is found to be 57degree and the angle
1. 2 answers
2. 601 views
The average rate at which energy is conducted outward through the ground surface in a certain region is 30.9 mW/m2, and the
1. 1 answer
2. 1,023 views
Iam stuck with this question.Please anyone help me. An airplane is flying at an altitude of 10,000m.The pilot sees two ships A
1. 1 answer
2. 687 views
Find all the values of theta between 0 degree and 360 degree, and state the quadrants in which they exist. (a)cos theta=-0.71
1. 1 answer
2. 791 views
What are some of the treatments for coronary artery disease?
1. 1 answer
2. 686 views
Explain what happens when a person with AB+ donates blood to a patient with A+ blood type?
1. 1 answer
2. 498 views
Explain the role of white blood cells in the body's defense against foreign substances.
1. 2 answers
2. 759 views
From an observer 0, the angles of elevation to the bottom and top of the flag pole are 36 degree and 38 degree respectively. The
1. 0 answers
2. 750 views
From an observer 0, the angles of elevation to the bottom and top of the flag pole are 36 degree and 38 degree respectively. The
1. 2 answers
2. 1,610 views
Using the complementary angle ratio results,find the value of x for the following. (a) cos(x+35)degree=sin x degree (b) sec x
1. 0 answers
2. 544 views
An airplane is flying at an altitude of 10,000m. The pilot sees two ships A and B. Ship A is due south of P and 22.5km away (in
1. 0 answers
2. 604 views
An aeroplane flies due north for 200 km and then turns due east and flies for a further distance of 325km. Find the bearing,to
1. 1 answer
2. 860 views
Using the exact trigonometric ratios of 45 degree,30 degree and 60 degree,evaluate the following,leaving where necessary your
1. 1 answer
2. 785 views
A sample of 50 people in Harrisburg indicates that 10 people of them know the name of the mayor of their neighboring city. Out
1. 2 answers
2. 273 views
An observer on top of a building 66 metres high,finds the angle of elevation to the top of a taller building to be 34
1. 3 answers
2. 1,353 views
Find the area of an equilateral triangle whose base is 10 cm.
1. 2 answers
2. 1,199 views
(1) Use the thermodynamic values to (a) deduce the enthalpy change of each reaction (b)state if the reaction is exothermic,or
1. 1 answer
2. 669 views
From a point on a lighthouse 76 metres above sea level,the angle of depression of a fishing boat 28 degrees.How far is the boat
1. 1 answer
2. 548 views
A surveyor finds two points A and B on a hillside to be 114.6 metres apart(measured along the line of sight) and finds the angle
1. 1 answer
2. 498 views
The top of a T .V .tower casts a shadow 35 metres long when the angle of elevation of the sun 57 degree40 minutes.How high is
1. 1 answer
2. 639 views
From an aircraft flying at 8000 metres above sea level the angle of depression of a ship is 36 degree15 minutes.How far is the
1. 1 answer
2. 460 views
A tourist viewing Sydney Harbour from a building 180 metres above sea level observes a ferry which is 850 metres from the base
1. 2 answers
2. 785 views
Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If
1. 1 answer
2. 670 views
Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If
1. 4 answers
2. 1,176 views
Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If
1. 1 answer
2. 1,256 views
Describe one benefit of the transpiration stream of a plant:
1. 0 answers
2. 468 views
A ship sailing on a course bearing 036 degrees is 5500 metres due south of a lighthouse.If the ship continues on this
1. 2 answers
2. 1,342 views
Mature phloem is a live tissue,whereas xylem is dead when mature.Explain why it is necessary for phloem to be alive to be
1. 0 answers
2. 1,235 views
Explain why a plant needs to move food around,particularly from the leaves to other regions:
1. 2 answers
2. 684 views
Explain what is meant by source to sink flow in phloem transport.
1. 0 answers
2. 580 views
Two patrol boats M3 and M7 leave port at the same time.M3 heads due west and M7 on a bearing 227 degrees.After 30 minutes M7 has
1. 2 answers
2. 813 views
A ship sails on a steady course bearing 106 degrees from A to B.If B is 76 nautical miles further east than A,find,to the
1. 2 answers
2. 749 views
After walking due west,turning and walking due south a man is 900 metres from his starting point and bearing 205 degrees from
1. 3 answers
2. 931 views
Describe one benefit of the transpiration stream of a plant:
1. 0 answers
2. 442 views
Describe two features of internal anatomy that distinguish monocot and dicot roots.
1. 1 answer
2. 697 views
In angle ABC,angle A=angle B=32degree and AB=108 mm,find the perpendicular height from C to the baseAB.
1. 1 answer
2. 589 views
Explain what is meant by source to sink flow in phloem transport.
1. 1 answer
2. 1,013 views
Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:
1. 3 answers
2. 6,407 views
Name three environmental conditions that increases the rate of transpiration in plants,explaining how they operate:
1. 1 answer
2. 1,024 views
A light air craft takes off flying die north then turns and flies 11 000 metres due west.The plane then has a bearing of 340
1. 3 answers
2. 1,490 views
The system H2 (g) + 3N2 (g) = NH3 (s) is at equilibrium.Use Le Chatelier's principle to predict the direction in which the
1. 1 answer
2. 807 views
If the temperature of the system PCl5 (g) =PCl3 (s) + Cl2 (g) + 92.5 kj. is increased, predict the direction of th Le
1. 0 answers
2. 779 views
The volume occupied by the reaction SiF4(g)+2H2O (g)=SiO2 (s)+4HF (g). is reduced.Predict the direction of shift in the position
1. 2 answers
2. 1,026 views
Describe two differences between xylem and phloem.
1. 1 answer
2. 469 views
What happens if water is lost from the leaves faster that it is taken up the roots?
1. 1 answer
2. 1,050 views
Does all the water which rises up a plant escape through the leaves?
1. 0 answers
2. 561 views
A lighthouse is 9.6 nautical miles from a ship which bears 156 degrees from the lighthouse.How far is the ship east of the
1. 3 answers
2. 1,165 views
The vertical angle of a cone is 110 degree and the diametre of its base is 186mm.What is its height?
1. 1 answer
2. 731 views
A chord subtends an angle of 68 degree at the centre of a circle of radius 200 mm.Find the length of the chord.
1. 1 answer
2. 869 views
The angle between two tangents from a point to a circle is 82 degree.What is the length of one of these tangents if the radius
1. 2 answers
2. 998 views
A rectangle has sides 170mm and 130mm.What is the angle between the diagonals?
1. 1 answer
2. 611 views
The diagonals of a rhombus are 320mm and 240mm in length.Find the angles of the rhombus.
1. 1 answer
2. 1,068 views
If cos A=3/5 and A is acute,find sin A,tan A,and sec A.
1. 1 answer
2. 388 views
Invent a unit to measure how fast you spend your money
1. 1 answer
2. 932 views
List the types of energy according to the: (a)content/particle arrangement (b)energy changes involved
1. 0 answers
2. 333 views
what is the unit for measuring the speed at which a motor spins?
1. 1 answer
2. 984 views
What is the apparent weight of a lead brick 2.0 in x 2.0 in x 8.0 in if placed in oil with density p=0.93 g/cm^3 (Ppb=11.4
1. 1 answer
2. 1,196 views
Why does the volume of air bubble increase as it rises toward the surface?
1. 1 answer
2. 485 views
For the party, 105 re and blue balloons were inflated. There were 3 red balloons for every 2 blue balloons. How many blue
1. 1 answer
2. 547 views

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