All Questions

can anyone solve:

can anyone solve:

3kg of plums and 2kg of apples cost £3.40, while 1kg of plums and 4kg of apples cost £2.80. Find the cost of 1kg of apples in pence.

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nickashley 2 hours ago

Can someone show me how to get the differential from this expression?

Thanks to my CAS I have the result but I don't know how it got it.

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Guest 3 hours ago

System of equations

hello can you please check this system of equations to true or false k == (Sqrt[y^2 - 2 y^3 - y^4 + 2 y + 1] + Sqrt[2 - 2 y] - k)/((y + 1) Sqrt[1 - y^2]), Sqrt[2]/2/m == k/(k - Sqrt[2 - 2 y]), n == Sqrt[2 - 2 Sqrt[1 - m^2]], z == Sqrt[2 - 2 y]/f == Sqrt[(zn)^2 read more ..

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Guest 5 hours ago

HLWP

In the sequence 121, 1221, 12221,...., the nth number consists of n copies of the digit 2, surrounded by two 1s. How many of the first 100 terms in the sequence are divisible by 3?

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Guest 9 hours ago

Help

What is the minimum possible value for y in the equation y = x^2 + 12x + 5?

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Guest 10 hours ago

Been stuck on this one help would be appreciated

A small radio transmitter broadcasts in a 27 mile radius. If you drive along a straight line from a city 35 miles north of the transmitter to a second city 31 miles east of the transmitter, during how much of the drive will you pick up a signal from the read more ..

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evanborot 11 hours ago

+128

Hard Prob

Let return the number of distinct ordered pairs of positive integers such that for each ordered pair, . Note that when , and are distinct. What is the smallest positive integer for which ?

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EvanWei123 11 hours ago

Help plz

A ball travels on a parabolic path in which the height (in feet) is given by the expression -16^2 +32t +15, where t is the time after launch. What is the maximum height of the ball, in feet?

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Guest 11 hours ago

For what real value of b is the expression ( minimized?

For what real value of b is the expression minimized?

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Guest Oct 22, 2019, 12:38 AM

+408

good study habits

I know that the majority of you are really good when it comes to studying, and skill.
Unfortunately though, my study habits are ineffective in a way and they are starting to lower my grades as I am extremely worried...
If it is okay with you read more ..

off-topic

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Nirvana Oct 22, 2019, 12:12 AM

Oct 21, 2019

A teacher is making her students do the attendance. She has 3 blue ink pens and 9 black ink pens. The put the pen back every time it is used

A teacher is making her students do the attendance. She has 3 blue ink pens and 9 black ink pens. The put the pen back every time it is used. What is the probability that the first three students will consecutively pick a blue ink pen?

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Guest Oct 21, 2019, 11:23 PM

Even integers

How many 6-digit EVEN integers between 100,000 and 999,999 sum up to 22? Thanks for any help.

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Guest Oct 21, 2019, 11:14 PM

HELP ASAP!!

A ball travels on a parabolic path in which the height (in feet) is given by the expression -25t^2+ 75t +24, where t is the time after launch. At what time is the height of the ball at its maximum?

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Guest Oct 21, 2019, 11:08 PM

Cumulative Practice Problems

Please help me answer problems 3 and 4 for I am confused about why the shapes are similar. Thank You!

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Guest Oct 21, 2019, 9:47:20 PM

???

what integer divided by six, less eighteen, is negative twenty two?

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Guest Oct 21, 2019, 8:29:31 PM

Quadratic Optimization.

A ball travels on a parabolic path in which the height (in feet) is given by the expression -25t^2+ 75t +24, where t is the time after launch. At what time is the height of the ball at its maximum?

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Guest Oct 21, 2019, 7:56:49 PM

mathis

sqrt(75)-sqrt(12)-sqrt(27)

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Guest Oct 21, 2019, 7:22:49 PM

Help

A linear function ff models a relationship in which the dependent variable decreases 4 units for every 2 units the independent variable increases. The value of the function at 00 is −2−2.
Move

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Guest Oct 21, 2019, 7:07:50 PM

+865

Write the expression for 'eight times the sum of the square of a number and three.'

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macabresubwoofer Oct 21, 2019, 6:31:52 PM

answer

what is $2000 at 7% interested for 2 years. compounded quarterly.

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Guest Oct 21, 2019, 6:14:48 PM

Help in Quadratic Optimization.

What is the maximum value of the expression -5r^2 + 40r - 12 for real r ?

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Guest Oct 21, 2019, 6:08:40 PM

help

A domino is a rectangular tile composed of two squares. An integer is represented on both squares, and each integer 0-9 is paired with every integer 0-9 exactly once to form a complete set. A is a domino that has the same integer on both of its squares. read more ..

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Guest Oct 21, 2019, 6:02:52 PM

Need help with this coordinate question.

Hi there everyone! I'm stuck on question 2c (find the exact x coordinate of E). Please help, thanks.

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Umbrella Oct 21, 2019, 3:57:39 PM

Word Problems

Hi! I love this calculator its very helpful to me. But I would like to know if you can do word problems or what I should use for a word problem.

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Guest Oct 21, 2019, 3:48:56 PM

Question about the the quotient rule for differential calculus

Hello everyone, could someone explain to me where I am wrong because I can't find the mistake.
The quotient rule I am using is as follows
with my result is
However, the CAS calculators result is read more ..

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Guest Oct 21, 2019, 2:54:54 PM

Help!! Multiplying Matrices .-.

Help plz! This is super confusing to me. Thanks~

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Guest Oct 21, 2019, 1:54:39 PM

Research Maths

What maths do I need to know to understand how to read scientific research? I know it's some probability and statistics but what and where on the web can I find this to teach myself? I have a relatively good understanding of mathematics in general. read more ..

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Guest Oct 21, 2019, 1:52:01 PM

+865

A White Heron (excerpt)

A White Heron (excerpt)
Sarah Orne Jewett

1The woods were already filled with shadows one June evening, just before eight o'clock, though a bright sunset still glimmered faintly among the trunks of the trees. A little read more ..

macabresubwoofer Oct 21, 2019, 1:44:43 PM

+865

W. E. B. Du Bois Jon Reese

W. E. B. Du Bois
Jon Reese

1 An outstanding critic, editor, scholar, author, and civil rights leader, W. E. B. Du Bois is certainly among the most influential blacks of the twentieth century. Born in Great Barrington, Massachusetts read more ..

macabresubwoofer Oct 21, 2019, 1:42:59 PM

Confusion about d/dx(e^x)

Hello, in my Math Class i was taught that d/dx(e^x) = e^x. This calculator is adding *ln(e) why would that be?

Also d/dax(e^(a*x)) = e^(a*x)*ln(e) but d/dx(e^(3*x))= 3e^(3x)*ln(e)
So shouldn´t d/dax(...) be a*e^(a*x)*ln(e) read more ..

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Guest Oct 21, 2019

Diff from Log

Hello, if i want the Differential from "log10(ax)" what happens to the a ? i would guess "1/a*x*ln(10)" but i am not sure because in the diff from "ln(ax)" the a fades away because "a*1/a*X"

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Guest Oct 21, 2019

Root mean square

Calculate the root-mean-square velocity and kinetic energy of CO, CO2, and SO3 at 282 K Part A Calculate the root-mean-square velocity of CO at 282 K .

heureka ●

Guest Oct 21, 2019

Please help

The following points are the vertices of a parallelogram. (0,0), (2,3), (7,3), (5,0)
Write a system of linear inequalities that represent the parallelogram.

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Guest Oct 21, 2019

-1

+101

Line Segment

help please

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Valeriia222 Oct 21, 2019

-1

+101

Midpoint Line Segment

help please

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Valeriia222 Oct 21, 2019

-1

+101

Distance Between Two Points

Help please

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Valeriia222 Oct 21, 2019

-1

+101

Conic Sections

Conic Sections Help

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Valeriia222 Oct 21, 2019

Help please thx

A ball travels on a parabolic path in which the height (in feet) is given by the expression , where t is the time after launch. At what time is the height of the ball at its maximum?

asinus ●●

Guest Oct 21, 2019

Oct 20, 2019

+201

DOES ANYONE KNOW WHAT HAPPENED TO ROM?

DOES ANYONE KNOW WHAT HAPPENED TO ROM?

So I've been noticing that all of Rom's answers look like this "....." read more ..

off-topic

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SVS2652 Oct 20, 2019

Please help! :) (Some modular arithmetic problems)

1) Suppose n is a positive number between 1 and 11 inclusive, and What is n?

2) Grogg skip counts by 11s starting at 12. He obtains the sequence: 12, 23, 34, ..., 1233. What is the remainder when the sum of all the terms read more ..

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Guest Oct 20, 2019

HEALLPPPP

Can someone please help with the following two systems of equations? Thanks!

2x+y=10
x-y=2 read more ..

SVS2652 ●

Guest Oct 20, 2019

algebra II help

Find such that is the square of a binomial.

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Guest Oct 20, 2019

Yeet

The speed of light to five sig fig is 2.9979*108 m/s. What is the (a) speed of light to three sig figs, (b) distance the light will travel in 30.5 seconds, (c) in 10 seconds, (d)

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Guest Oct 20, 2019

+342

differential equation bernoulli

I need a little dit help
In this equation
I stuck at this point:
But its 100% false because its not bernulli at this point,I need an other way,any help? read more ..

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Dimitristhym Oct 20, 2019

+40

MODULAR ARITHMETIC II

Suppose you want to fill the 5x5 square below with the following restrictions:
(1) The numbers 1-5 must appear in every row and column;
(2) The sum of the numbers in gray boxes is 2 (mod 6).

read more ..

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mathleteig Oct 20, 2019

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