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lindsay
Questions and answers by visitors named
lindsay
Questions (113)
The sum of the first 20 terms of an arithmetic series is identical to the sum of the first 22 terms. If the common difference is
5 answers
6,969 views
a species of orchid is being studied. The population 'p' at time 't' years after the study started is assumed to be p =
4 answers
1,605 views
Hi I have 2 questions I hope someone can help me :)
1)A pocket of gas is discovered in a deep drilling operation. The gas has a
1 answer
671 views
1)A pocket of gas is discovered in a deep drilling operation. The gas has a temperature of 480c and is at a pressure of 12.8
1 answer
839 views
factor:
(x-1)^1/2 - x(x-1)^-1/2 ive tried multiple different ways to firgure it out, but i cant seem to get too far in my work, i
1 answer
307 views
I was doing a spectroscopy problem, and on the NMR spectrum a peak at around 4.4 with 2 H says "exchanges with D2O". What does
1 answer
474 views
what is mass?
4 answers
251 views
Solve: A jar contains 45mL of corn syrup whose mass is 41.4g and 90mL of glycerin whose mass is 75.4g. Which liquid is on top?
SH
1 answer
364 views
Find the coordinates of the center and the radius of a circle with and equation of:
a. x^2 + 2root7x +7 + (Y-root 11)^2 =11 b.
1 answer
400 views
Compare and contrast the American and french revolution
2 answers
816 views
What would be a better conclusion to my paper?
Depression, anxiety, and other mental illnesses are worldwide to be thought of
4 answers
600 views
You want to estimate 5.25-3.3
why would using front-end estimation tell you more about the answer than rounding?
3 answers
538 views
why would using front-end estimation tell you more about the answer than rounding?
1 answer
409 views
why would using front-end estimation tell you more about the answer than rounding?
1 answer
456 views
Between what 2 planets does the asteroid belt lie?
1 answer
367 views
What is the temperature of an ideal gas whose molecules have an average translational kinetic energy of 3.90 10-20 J?
K
2 answers
741 views
3n-1=5n-9
1 answer
228 views
6-3a/2=-6
1 answer
215 views
what is the length of an equilateral triangle when the area is 45 meters square?
2 answers
692 views
Which of the following parts of speech is most often used with a noun to create a descriptive phrase?
A. pronoun B. preposition
5 answers
419 views
A survey was conducted to measure the number of hours per week adults spend on home
computers. In the survey, the number of hours
4 answers
1,637 views
Given that the graph of f(x) passes through the point (2,5) and that the slope of its tangent line at (x, f(x))is 3x+5, what is
4 answers
3,649 views
Given f"(x)=-8sin3x and f'(0)=-1 and f(0)=-6. Find f(pi/5).
i got stuck with f(pi/f) f"(x)=-8sin3x f'(x)=8cos3x+c
3 answers
290 views
the fundamental theorem of calculus,
f(x)=∫(0,x) t^3+2t^2+2dt, and find f"(x). my answer was: f'(x)=x^3+x^2+2 f"(x)=x^4/4 +
2 answers
501 views
given triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate
1. the size of the largest angle 2. the area of the triangle
4 answers
2,408 views
a ship travels 8km due north then 7km on a bearing of 070 degrees
1. draw a diagram to represent the information 2. calculate the
3 answers
728 views
express 3 cos x -2 sin x in th eform R cos (x + a) and hence write down the maximum and minimum values of 3 cos x - 2 sin x.
2 answers
852 views
state the amplitude, period and phase shift of the function y=tan (20-80 degrees)
3 answers
463 views
state the amplitude, period and phase shift of the function y = tan (2 theta- 180 degrees)
2 answers
518 views
Find all the angles between 0 degrees and 360 degrees which satisfy the equations
a. 8 cos x sin x = sin x b. 5 tan^2 y + 5 tan y
4 answers
2,163 views
two pieces of wire stretched from the top, M of a vertical pole to the points L and N on the horizontal ground. the angle of
3 answers
1,389 views
Hal walked from point A to point B due north east from a distance of 20m. He immediately changed direction and walked 50m from B
2 answers
1,027 views
Solve the equation 6 cos x^2+sin x=4 if 0 is less than or equal to x is less than or equal to pi
3 answers
508 views
Find the general solution for f(x) = 27 tan^2 x-9=0
2 answers
1,101 views
show that sin 2theta/1-cos 2 theta = cot theta
3 answers
1,463 views
a closed box of uniform thickness is made of wood 1cm thick. Its extenal dimensions are 6cm and 5 cm by 4 cm. Find the
a. volume
2 answers
634 views
the diagonal VY of a cuboid =root(26.25)cm, the length of a side ZY = 4cm and the height of a sideUZ =25cm for the cuboid. Find
1 answer
426 views
Write an equation for each circle if the coordiantes of the center and length of the radius are
a. center(-1,-5) radius = 2 units
1 answer
402 views
Find the coordiantes of the center and the radius of each circle
a. (x+root5)^2 + y^2 -8y =9
1 answer
355 views
solve the equation: 4 tan^2 x + 12 sec x +1 =0, for 0 degrees is less than or equal to x is less than or equal to 360 degrees.
4 answers
2,412 views
Given that tan A = 2 tan B (B is the symbol for Beta) show that tan (A-B) = sin 2B/3- cos2 Beta.
1 answer
445 views
Find all the angles between 0 degrees and 360 degrees which will satisf y the equation:
5tan^2 y +5 tan y = 2 sec^2 y
1 answer
395 views
Find all the solutions of x,for 0 is less than x is less than 2 pi
a. Sin(x + pi/4 + sin(x - pi/4)= -1 b. Sin(1/3 x+5) = 1/2
1 answer
397 views
In the triangle ABC, the sides AB and BC have lengths 7cm and 8cm respectively, and angle B is obtuse. the area of the triangle
5 answers
711 views
I need help in understanding how to identify which identity to use. using this question as an example.
Show that tan theta (sin
2 answers
553 views
R =(cos0 -sin0)
(sin0 -cos0) State the matrix R for 0=120 degrees NB 0 represents theta
1 answer
967 views
The points A=(1,1) B=(3,4) connects to point C (3,1).
a. Find the length of AB b. The gradient and equation of line AB
3 answers
331 views
The towns A and B are on the circle of latitude 24 degrees N.The longitude of A is 108degrees E and longitude B is 75 degrees E.
1 answer
888 views
Given that P=(2,10)
(5,-3) a. Evaluate the inverse P^-1, of P b. use a matrix method to solve x(2,5)+ y(1,-3) =(7,1)
1 answer
359 views
a metal ball with a charge of 5.4x10^8 electrons is touched to another metal ball so that all the excess electrons are shared
2 answers
1,243 views
a square with side length 2.0 cm has a charge of -1.0x10^-6C at every corner. What is the magnitude and direction of the
3 answers
776 views
to start a nuclear fusion reaction, two hydrogen atoms of charge 1.602x10^-19 and mass 1.67x10^-27kg must be fired at each
3 answers
615 views
solve: n squared + 5n = 84 for n?
2 answers
674 views
simplify the following giving your answer with a rational denominator,
2 root3 - root 3/ 2 + root three.
1 answer
442 views
Solve the equation
3^2x - 12 x 3^x + 27 = 0
3 answers
2,037 views
Solve the inequality 2x^2<12-5x
3 answers
336 views
What ia A inverse if A = (3 -2)
(3 2)
1 answer
278 views
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object.
2 answers
928 views
How many photons are produced in a laser pulse of 0.324 J at 631 nm?
1 answer
381 views
How to solve
13 is 10 percent of what number?
1 answer
263 views
I need to sketch the graph of t(x)=2x^2 +3x > or equal to 10x-x^2. How do I work out the points to plot on the graph?
2 answers
1,089 views
The function f:x =2x+1/x-3 and g:x =1-x/2
a. For what value of x is 'f' undefined? b. Find 'f' inverse and hence solve f(x) =1/3.
1 answer
290 views
Find the range of values of 'c' for which g(x)= -3x^2-4x-c has complex roots
2 answers
905 views
Given that h(x) =x+1/x-2 and g(x)=4-x.
Find hg(x) and find gh(x)
1 answer
330 views
Given that h(x)=x+1/x-2 and g(x) =4-x. Find h(g)(x) and find g(h)(x).
P.S. Thanks for the correction Steve.
1 answer
260 views
If f(x)=2x+1/x-3 and g(x)=1-x/2
Show that f(g)(x)=g(f)(x)
3 answers
739 views
Calculat the absolute value of:
4-{x-3}=0 PS. The brackets are supposed to be the straight lines for the absolute symbols.
3 answers
451 views
3. Write the function R that models the total number of components that reenter the atmosphere around the earth each year.
1 answer
1,050 views
Current price is $100, current salesbare 5000 units. For every increase in price of $1, sales decrease by 20 units. Find optimum
1 answer
888 views
Can you explain how I find the values so I can plot a graph of
T=(25 ln24/ln) -(25/ln2) ln M
1 answer
330 views
A sector AOB of a circle, centre O, radius r cm, where the acute angle AOB is theta radians. Given that the perimeter of the
1 answer
854 views
A sequence is generated by the recurrence relation Ur+1 = 1/Ur -3. Given that U2 = U1 find the possible of U1
3 answers
823 views
This is a matrix question but I can't get a single bracket so I will use two.
(a b)(5 1) =(12 -2) (3 0)(-2 4) (15 3) Find the
1 answer
285 views
This is a matrix question.
R is the matrix (3r 1) (s 2s) 1. State, in terms of s and r the determinant of R 2. If r=1/3 and s=4
3 answers
655 views
This is a matrix question.
R is the matrix (3r 1) (s 2s) 1. State, in terms of s and r the determinant of R 2. If r=1/3 and s=4
1 answer
529 views
find the exact value of [sec(-30 degrees)- cot 120 degrees]/1-cosec^2(45 degrees)
Find the exact value of [sin^2(355 degrees) +
2 answers
685 views
The 9th term of an AP is 8 and the 4th term is 20. Find the first term and the common difference.
4 answers
3,227 views
Triangle XYZ with vertices X(3,-1) Y(7,-3)Z(3,-5) undergoes an enlargement represented by the mapping:
x
1 answer
969 views
Triangle XYZ with vertices X(3,-1) Y(7,-3)Z(3,-5) undergoes an enlargement represented by the mapping:
(x)--(-0.5 0)(x) +(-3)
1 answer
413 views
Simplify
cos Theta/4 cos theta/4 - sin theta/4 sin theta/4.
1 answer
320 views
Given the function
y= 4cos(2x+90degrees)-3, Find the value of y when x =30 degrees.
1 answer
318 views
Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.
2 answers
815 views
Solve the equation 8 cos^2 X -2 =0 given that 180< or equal to X <or equal to 360 degrees.
2 answers
1,116 views
If the bearing fron H to G is 098 degrees, what is the bearing of G from H
3 answers
839 views
Prove that Sin x + tan x / 1+cosx =tan x
1 answer
327 views
Dave walked from point A to point B due North East for a distance of 20m. He immediately changed direction and walked 50m from B
2 answers
1,091 views
Dave walked from point A to point B due North East for a distance of 20m. He immediately changed direction and walked 50m from B
2 answers
523 views
Two pieces of wire are stretched from the top M, of a vertical pole to the points L and N on the horizontal ground, The angle of
2 answers
524 views
Find the exact value of
1. tan 75 degrees 2. Cos 15 degrees 3. Sin 105 degrees
4 answers
1,256 views
The following statement defines a relation R in the natural numbers N. state whether or not each relation is symmetric
1. x is
1 answer
345 views
The equation kx^2 -2x-7=0 has two real and identical roots, find the value of k.
1 answer
369 views
solve the following absolute value question
/4x + 5/ =25
1 answer
250 views
What is the negation of p and q?
2 answers
966 views
solve the following inequality
/3x + 12/ >/ 21 PS >/ means greater than or equal to.
3 answers
447 views
0.06 2/3 into a fraction
4 answers
834 views
A floor measures 10m by 5m is to be covered with flooring boards measuring 1m 20cm. How many flooring boards would be needed to
3 answers
651 views
Given that x = 2log t is a solution of the equation10^(2x+1) -7(10^x) -26 =0. Find t
1 answer
401 views
Solve
3 log x = 1 + log (4x+5)/ log 2
1 answer
331 views
Solve
4^y -7(2^y) = 8
2 answers
858 views
Given that 2 log base2 (x+15) - log base2 x = 6
1.Show that x^2 -34x +225 = 0 2. Hence or otherwise solve the equation 2 log base
4 answers
2,625 views
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