Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 325

**maths**

A parallelogram has two adjacent sides of length 4cm and 6cm reapectively. If the included angle measures 52 degrees, find the area of the parallelogram.

**maths**

John wishes to determine the height of a flagpole. He takes a sighting of the top of the flagpole from point P. He then moves further away from the flagpole by 20 metres to point Q and takes a second sighting. Given the angle Q is 28 degrees and angle P is 53 degrees. Find how...

**maths**

An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t is given by the formula; h = 520 - 5t^2, where h is in metres and t is in seconds. Find how long it takes for the box to fall to the ground.

**maths**

Please I need help..how can I solve this guadratic equation?? 520 - 5t^2 = 0

**maths**

Solve this equation by completing squares and then check the solution.. x = 21/x-4

**maths**

a)Express y = 2 (x - 1) (x - 5) in the form y = ax^2 + bx + c. b) From the above quadratic equation calculate the following: I) x and y intercepts II) Coordinate of the turning point III) Is the graph a maximum or minimum turning point?

**maths**

An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t, is given by the formula: h = 520 - 5t^2 , where h is in metres and t is in seconds. Find how long it takes for the box to fall to the ground.

**maths**

Write without negative indices: a^-3b/c^-1

**maths**

Write 1/2^1-n in non- fractional form.

**maths**

Write as powers of 2. (a) 16 (b) 2^m/8

**maths**

Find the coordinates of the points of intersection of the straight line y = 3x - 6 with the parabola y = x^2 - 6x + 8 and solve Graphically.

**maths**

Given the quadratic equation y = -x^2 + 2x + 3. a) Will the graph turn upwards or downwards? b) What are the coordinates of x and y intercepts? c) What is the coordinate of the turning point? d) Use your answer in parts (a,b,c and d) to sketch the graph.

**maths**

2/ x^2 - 9xy^2 - 3/3x + 12y

**maths**

Simplify; x^2 - x - 6/ 6xy divide x^2 - 9/2x^2y

**maths**

Simplify; (x - y)^3 divide x^2z - 2xyz + y^2z

**maths**

Simplify 5x/7 × 15y/8x

**maths**

Simplify; p^2 - p - 42

**maths**

Solve this equation; p^2 - p - 42

**maths**

Solve this equation; p^2 - p - 42

**maths**

Simplify; x^2 + ax + bx + ab divide x^2 + 2ax + a^2.

**maths**

Simplify this expression; X^2 + ax + bx + ab/x^2 + 2ax + a^2

**maths**

Simplify 5x/7 × 15y/8x

**maths**

Solve this equation. 2/5 (x^2 + 1) = x

**maths**

Find the coordinates of the points of intersection of the straight line y = 3x - 6 with the parabola y = x^2 - 6x + 8. a) Graphically b)Prove your answer in (a) algebraically

**maths**

Given the quadratic equation y = -x^2 + 2x + 3. a) Will the graph turn upwards or downwards? b)What are the coordinates of x and y intercepts? c)What is the coordinate of the turning point? d)Use your answer in parts (a,b,c,and d) to sketch the graph.

**algebra**

How do you factor 2a^2+5x+3

**maths**

Write the equations below in the form y = mx + c. State how many solutions each systems of linear equation have. 3x = 6y 2y - 6x + 2 = 0

**naths**

What is the equation of the line which has gradient 2, and passes through midpoint of (3,4) and (5,6)

**maths**

What is the value of p if the line (3p + 1)x - 2y = 6p is perpendicular to the line 2x - y + 1 = 0

**maths**

Solve 2y - 5x = 3 and x + y = 5 using substitution.

**maths**

Show by calculations weather the following lines are parallel or not.. y + 5x = 1 and 0.2 = y - 5.

**maths**

Construct the table of values for the following equation 1 - 3x = 2y for -4<x <4. Use the answer to sketch the graph.

**math**

a recipe calls for 2 and 3/4 cups of milk. how many cups of milk written as a fraction greater than one are used in the recipe?

**Science**

If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support.

**math**

One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 7 days. How long will it take two pumps, working together, to empty the pool?

**physics**

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire

**physics**

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire?

**maths**

When the function f(x) is equal to 2xn + ax2 - 6 is divided by (x-1), the reminder is -7 and when divided by (x+3), the reminder is 129. Calculate the value of "a" and "n" and hence write the polynomial function completely.

**maths**

Calculate the arc length that subtends an angle of 55 degree at the centre of a circle with radius r = 5cm.

**maths**

The relationship between the vertical height and the horizontal distance of a ball thrown at 45 degree is given by the equation y = x - x^2/50, where y is the vertical height and x is the horizontal distance. (a) Find the maximum vertical height reached. (b) Find the horizonta...

**maths**

The length of a rectangle is 10cm greater than its width. The perimeter of the rectangle is 1m. Find the simplest expression for the perimeter if the width is x.

**Maths**

Find dy/dx if y = 1/8.

**maths**

Does the parabola y = -3x^2 + 2x - 1 have a maximum or minimum value?

**maths**

Find the line that is perpendicular to y = -3/4 x + 2 and passes through (3,4).

**maths**

Sine and Cosine rule are both used in solving trigonometry problems.Give an example of when the cosine rule is more appliciable than the sine rule?

**maths**

Find the two stationary points on the curve when y = 2x/x^2 + 1

**maths**

A circle x^2 + y^ + 2x - 2y -1 = 0 expressed in the following form (x-h)^2 + (y-k)^2 = r^2 where h, k are the coordinates of the centre. How is r the radius given?

**maths**

A circle x^2 + y^ + 2x - 2y -1 = 0 expressed in the following form (x-h)^2 + (y-k)^2 = r^2 where h, k are the coordinates of the centre. How is r the radius given?

**Chemistry**

0.2 Faradays of electricity were passed through solutions of sulphuric acid. Calculate the volume of hydrogen evolved at s.t.p in sulphuric acid.

**Chemistry**

What would be the product formed for electrolysis of copper sulphate between the electrodes (a) Platinum (b) Copper and NaCl (aq) between (a)Platinum and (b) Copper electrodes?

**math**

what are the examples of exponetial notations

**maths**

Find the wind velocity if course 060 degree, airspeed 250km/h; track 040 degree, ground speed 260km/h.

**maths**

Find the course and ground speed if Track 150 degree, airspeed 400km/h; wind 040degree, 30km/h.

**maths**

Find the indicated term for (1-2x)^10, middle term.

**maths**

Find the ratio of the coefficients of the 4th and 6th terms in the expansion of (1 + 2x)^16

**chemistry**

This balance equation shows the burning of octane in air. 2C8H18 + 25O2 ----> 16CO2 + 18H2O. How many grams of carbondioxide will be produced when 1 mole of octane burns completely?

**maths**

Find the expansions of (1-x)^6 and (1+2x)^6 as far as the terms in x^3. Hence expand (1+x-2x^2)^6 up to the terms in x^3.

**maths**

The coefficient of x^2 is 69 in the expansion of (1-ax)^24, where a>0. Find the coefficient of x^3.

**maths**

Expand (1-x)^4. Hence find S if S = (1-x^3)^4 - 4(1-x^3)^3 + 6 (1-x^3)^2 - 4(1-x^3) + 1.

**maths**

In the expansion of (1-2x)^11 the coefficient of x^3 is k times the coefficient of x^2. Evaluate k.

**maths**

Expand (1-6x)^4 (1+2x)^7 in ascending powers of x up to and includeing the terms in x^3.

**maths**

In the expansion of (1-2x)^11 the coefficient of x^3 is k times the coefficient of x^2. Evaluate k.

**maths**

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 - (0.98)^20 to 3 significant figures.

**maths**

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 estimate the value of 1.9 times (1.05)^8.

**Maths**

Pls help me to show that (1+root x)^5= 10 root x + 20x root x + 2x^2 ]oot x.

**chemistry**

1. In the following reactions, identify which reactants are the oxidizing agent and which are the reducing agents. a. 2S2O32- (aq) + I2 (s) ¨ 2I- (aq) + S4O62- (aq) b. NO3- (aq) + Zn (s) ¨ Zn2+ (aq) + NO2 (g)

**Chemistry**

A solution container was only label 0.005M. When phenolphthalene was added onto the solution, the color of the solution turned pink. After identifying the type of solution,it was later titrated with sodium carbonate. If the solution was sulphuric acid,determine the (a) [H+] , ...

**Chemistry**

Determine the [H+] when [OH-] is 2.0 times 10^-2 mole.dm-3.

**maths**

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, calculate; (a) The radius of the circle. (b) The angle AOC in both degrees and radians. (c) The area of the shaded region.

**Maths**

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 which slopes uniformly uphill towards the mountain. From this point, which is 50 metre above sea level, he measures the angle of elevation as 40 degree...

**Chemistry**

Calculate the [H], [OH], pH and the pOH of this solution; 0.0025 M NaOH

**maths**

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 the magnitude of a. (c) Find the unit vector in the direction of a.

**Maths**

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, calculate; (a) The radius of the circle. (b) The angle of AOC in both degrees and radians (c) The area of the shaded region.

**maths**

Expand (1-x)^4.Hence find S if S = (1-x^3)^4 - (1-x^3)^3 + 6(1-x^3)^2 - 4(1-x^3) + 1.

**maths**

Find two geometric progressions having: 54 as third term and 27/32 as ninth term.

**Maths**

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 half-yearly and the rate is 14% p.a.

**Maths**

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 (b) geometric

**Maths**

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 divided by x + 1. (b) Factorize f (x) completely and hence solve for x.

**maths**

If the nth term of a sequence is 3 x 2^n-1, Write down the first three terms.

**maths**

Find two geometric progression having: 2 as second term and 1458 as eight term,

**Chemistry**

One step of the Ostwald process for manufacturing nitric acid involves making nitrogen monoxide by oxidizing ammonia in the presence of a platinum catalyst: 4NH3 (g) + 502 (g)>> 4NO (g) + 6H2O (g). If the percentage yield is 80.3%, how many grams of NO can be produced fr...

**Chemistry**

When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.

**Chemistry**

When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.

**MATHS - URGENT**

Write the expression in terms of sine only. 8(sin 2x − cos 2x)

**math**

tan(180-x)sin(360-x)cos90-x)cos(-x)/sin(x-180)cos(450+x)tan(180-x)

**7th math**

I just printed ine of them. 5 pages. Helpful thanks and I saved the other site.

**7th math**

Thanks too.

**7th math**

I'm having a hard time remembering these inequalities. DO you know of a site on the internet for me to practice?

**7th math**

I have no more than five books in my bag. I need to write an inequality for this, x<5 ?

**math**

Your favorite breakfast cereal contains a toy dinosaur in each box. There are four different dinosaur toys in the complete collection, and each one has an equal chance of being in each box. You want to figure out what the probability is that you will get more than one tyranosa...

**math**

2005 2006 2007 2008 Plant 1 20 4 25 10 Plant 2 25 5 5 48 Plant 3 20 8 20 32 Plant 4 43 10 10 47 Plant 5 40 11 15 48 A gardener recorded how many tomatoes 5 plants produced each year. Which year had the LARGEST interquartile range of tomatoes produced? A) 2005 B) 2006 C) 2007 D...

**Math**

Is that the answer or what I have x< =5.5 then i line on a number line half between 4 and 5 going left on a closed circle. Right?

**maths**

solve this equation. log (2x + 1) base 2 = -3

**maths**

Solve this logarithmic equation. 3 log 2 base x + log 18 base x = 2

**maths**

Solve this logarithmic equation. 3 log 2 base x + log 18 base x = 2

**maths**

Solve this equation. 3^2x - 3^x+2 = 3^x - 9

**maths**

Proof this identities. (a) sin x cot x = cos x

**maths**

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

**maths**

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 (c) 3^a+2 times 9^2a+1 divide by 6^2 times 3^5a+3

**Maths**

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. Calculate the bearing of A from B and the distance AB.