All Questions ⁺⁰231337 Questions

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211

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Roots

The The roots of the quadratic equation z^2 + bz + c = 0 are -7 + 2i and 3 + 4i. What is b + c?

Guest Nov 21, 2021

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341

1

+136

Plz help quick.

Solve the inequality . Give your answer as an interval.

NaturalDisaster Nov 21, 2021

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254

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Number Theory

There exist several positive integers x such that 1/(x^2 + 2x) is a terminating decimal. What is the second smallest such integer?

Guest Nov 21, 2021

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218

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Nr.1 Charakterisiere die Zusammensetzten des globalen Wassergebots

Nr.1 Charakterisiere die Zusammensetzten des globalen Wassergebots
Nr.2 Analysiere die Entwicklung des Wassergebrauchs in Deutschland
Nr.3 Analysiere die globale Situation der Wasserversorgung
Nr.4 a) Erkläre read more ..

Guest Nov 21, 2021

+1

316

1

is this correct? I feel like somethings wrong

is this correct? I feel like somethings wrong

Guest Nov 21, 2021

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325

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+4

ERROR TIME OUT, HELP

When I use x
Example: x+1=3 = Error: timeout

IT GIVES Error: Timeout read more ..

Melody ●●●

Hartelin Nov 21, 2021

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236

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Algebra

Let S = 1 + 2 + 3 + ... + 2010. What is the residue of S, modulo 2010?

Guest Nov 21, 2021

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325

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help number theory

What is the remainder when 5^(301) is divided by 7?

Guest Nov 21, 2021

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317

1

Trig problem?

Consider the following points on the graph of : y= cos(x)

Find a and b read more ..

Guest Nov 21, 2021

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258

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Number Theory

If 1 + 12 + 123 + 1234 + 12345 + 123456 + 1234567 + 12345678 + 123456789 + 1234567890 + 12345678901 + 123456789012 is congruent to n modulo n, where 0 <= n < 9, what is the value of n?

Guest Nov 21, 2021

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227

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Counting

Nine stones are arranged in a straight line. They are counted from left to right as 1, 2, ..., 9, and then from right to left, so that the stone previously counted as 8 is counted as 10. The pattern is continued to the left until the stone previously read more ..

Guest Nov 21, 2021

Nov 20, 2021

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211

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The line from through the midpoint intersects the -axis at. What are the coordinates of? Write your answer in the form where and are real

The line from through the midpoint intersects the -axis at. What are the coordinates of? Write your answer in the form where and are real numbers.

Guest Nov 20, 2021

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229

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Digit question

What is the ones digit of 1^2009 + 2^2009 + 3^2009 + ... + 2009^2009 + 2010^2009 + 2011^2009 + 2012^2009?

Guest Nov 20, 2021

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196

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Inverse Functions

If f(x) = (x - 3)/(-x - 4), then for what value of x is $f^{-1}(x)$ undefined?

Guest Nov 20, 2021

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247

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trig

In triangle ABC, we have A = 90 and sin B = 4/17. Find cos C.

Guest Nov 20, 2021

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214

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Algebra

Find all pairs (x,y) of real numbers such that x + y = 10 and x^2 + y^2 = 56 + 2xy.
For example, to enter the solutions and , you would enter "(2,4),(-3,9)" (without the quotation marks).

Guest Nov 20, 2021

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193

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trig question

In triangle ABC , we have A = 90 and sin B = 4/17. Find cos C.

Guest Nov 20, 2021

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206

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Coordinates

The line y = (3x + 20)/5 intersects a circle centered at the origin at A and B. We know the length of chord AB is 20. Find the area of the circle.

Guest Nov 20, 2021

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197

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Counting

We say that a set of integers is sparse if any two elements in the set differ by at least 3. Find the number of sparse subsets of 1, 2, 3, ... , 12, 13, 14 (Note that the empty set is also sparse.)

Guest Nov 20, 2021

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487

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+677

'Physic forum' or 'Math forum'?

Hi everybody,

is this a "Physic forum" or a "Math forum"? (= (turn your head to see the smiley)
read more ..

Straight Nov 20, 2021

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193

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Coordinates

For some positive real number r, the line x + y = r is tangent to the circle x^2 + y^2 = 2r. Find r.

Guest Nov 20, 2021

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257

1

is this right pls help

is that answer right?? thx

Guest Nov 20, 2021

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317

2

trig question

In right triangle ABC with B = 90 , we have 2 sin A = 5 cos A. What is tan A?

Guest Nov 20, 2021

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243

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Counting question

If M is the set of positive multiples of 2 less than 150 and N is the set of positive multiples of 9 less than 150, how many members are there the union of M and N?

Guest Nov 20, 2021

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214

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trig question

In triangle PQR, we have angle P = 90, QR = 15, and tan R = 6 cos Q. What is PQ?

Guest Nov 20, 2021

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