All Questions

194

Number Theory

Find all positive integers n for which n^2 - 19n + 93 is a perfect square.

Guest Sep 25, 2021

239

Coordinates

What is the equation of the line that passes through the point (-1,-7) and has a slope of 2

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Guest Sep 25, 2021

Sep 24, 2021

305

help geometry

Given right triangle ABCwith altitude BD drawn to hypotenuse AC. If AD=4 and DC=8, what is the length of BD? (Note: the figure is not drawn to scale.)

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Guest Sep 24, 2021

327

Geometry

Circles A and B are externally tangent. Angle PAB is a right angle. Segment PT is tangent to circle B at T. If the radius of circle A is 1 cm and the radius of B circle is 4 cm, what is the length of segment PT in cm?
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Guest Sep 24, 2021

283

Geometry

Segment BD and AE intersect at C, as shown, AB = BC = CD = DE, and angle A = 3 angle B. What is the degree measure of angle D?

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Guest Sep 24, 2021

343

Radicals and Complex Numbers

Radicals and Complex Numbers Need Help

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turtelscanflyinwater Sep 24, 2021

424

Please help fast thank you

In triangle $ABC$, points $D$ and $F$ are on $\overline{AB},$ and $E$ is on $\overline{AC}$ such that $\overline{DE}\parallel \overline{BC}$ and $\overline{EF}\parallel \overline{CD}$. If $AF = 9$ and $DF = 3$, then what is $BD$?

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Guest Sep 24, 2021

318

Counting and Probability Problem

Let n be a positive integer.
(a) Prove that

by counting the number of ordered triples (a,b,c) of positive integers, where 1 ≤ a,b,c ≤ n in two different ways.
(b) Prove that
<#> by counting the number of subsets read more ..

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Guest Sep 24, 2021

410

a rail road crew can replace 450m of rail in three days. How many kilometers of real can they repair in 24 days?

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Guest Sep 24, 2021

232

Please help

Luis spent 1/6 of his money and an additional $5 on a pen. He then spent 2/5 of his remaining money and an additional $12 on a number of magazines. If he had $24 left, how much money did he have at first?

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Guest Sep 24, 2021

196

Algebra

Simplify the following: (2y-1)(4y^{10}+2y^9+4y^8+6y^7). Express your answer as a polynomial with the degrees of the terms in decreasing order.

Guest Sep 24, 2021

192

geometry

Given right triangle ABC with altitude BD drawn to hypotenuse AC. If AC=20 and DC=6, what is the length of BC? (Note: the figure is not drawn to scale.)

Guest Sep 24, 2021

359

help Algebra

In an arithmetic series, the 6th term is 39. In the same arithmetic series, the 19th term is 7.8. Work out the sum of the first 25 terms of the arithmetic series.

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Guest Sep 24, 2021

377

Probability

Two real numbers are chosen at random between 0 and 2. What is the probability that their sum is no more than 1?

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Guest Sep 24, 2021

358

stuck

The
Travers
are adding a new room to their house. The room will be a cube with volume
6,859 read more ..

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Guest Sep 24, 2021

336

Coordinates

This circle passes through the points (-1, 2), (3,0) and (8,0). The center of the circle is at (h,k). What is the value of h+k?

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Guest Sep 24, 2021

321

Parabola

Find the coordinates of the vertex of the following parabola algebraically. Write your answer as an (x,y) point.

y = x^2 + 2x + 8.

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Guest Sep 24, 2021

354

hey plz help

. Jason jumped off of a cliff into the ocean in Acapulco while vacationing with some friends. His height as a function of time could be modeled by the function h(t) =-16t2+16t+480, where t is the time in seconds and h is the height in feet.
read more ..

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Guest Sep 24, 2021

317

Help math

Two trains leave a station at the same time. one train returns to the station in 45 minutes and leaves again. The other train returns in 75 minutes and leaves again. after how many minutes will both trains return to the station at the same time?
<read more ..

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Guest Sep 24, 2021

174

Math

Express the equation of the line passing through points (1,7) and $(-2,3)$ in the form ax+by=c, where a, b and c are integers, the greatest common divisor of a and b is 1, and c<0.

Guest Sep 24, 2021

289

Help

John bought 7 rulers and 12 magnets with 1/3 of his savings. The
cost of a magnet is 3 times the cost of a ruler. He used 2/3 of his
remaining allowance to buy more rulers. Hence, how many rulers did
he buy altogether? read more ..

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Guest Sep 24, 2021

331

Pls help, thanks!

A shop had 256 more curry puffs than sardine puffs at first.
After selling of the curry puffs and of the sardine puffs, there were
377 more curry puffs than sardine puffs left.
read more ..

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Guest Sep 24, 2021

275

Pls help thank you

Fred spent 4/9 of his money on 12 apples on 8 pears in the morning. He bought 3 apples and 8 pears in the afternoon from the same shop and had some money left. A pear cost thrice as much as an apples. How many more apples can he buy with the remaining money read more ..

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Guest Sep 24, 2021

All Questions ⁺⁰231295 Questions

Number Theory

Coordinates

help geometry

Geometry

Geometry

Radicals and Complex Numbers

Please help fast thank you

Counting and Probability Problem

a rail road crew can replace 450m of rail in three days. How many kilometers of real can they repair in 24 days?

Please help

Algebra

geometry

help Algebra

Probability

stuck

Coordinates

Parabola

hey plz help

Help math

Math

Help

Pls help, thanks!

Pls help thank you

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